I have mixed feelings on this, but I think I ultimately agree. On the one hand people who want to boss more can go do that & get ahead, while people who have less time or don't want to boss more will fall behind & that's fine (I myself am feeling burnt out from bossing so I'm just accepting I'm going to start falling down in the rankings in the near future, but whatever). Also to this point, player's will feel it's unfair that some players got the benefits of doing all of these bosses 2x/day.
One the other hand, the playing experience in my opinion is worse than it could be, due to so much bossing. It gets gradually more hectic, & once players are 180+, the top top players that want to be #1, this is what a typical "ideal" day would look like: 2x Chaos Horntail, 2x Horntail, 2x Von Leon, 2x The Boss, 2x Toad, 2x Wulin, 2x CZAK, 2x ZAK, 2x Chaos Scarga, 2x Krex, 2x CWKPQ, 4x APQ, 4x GPQ, 2x Balrog? (idk haven't done it or heard of ppl doing it), 2x MVPQ. Tbh only Scarga/Chaos Pap/Pap feel like you're not falling behind by not doing them as they're low in spirit points & Scarga exp worse than say Krex. As far as I know high level people don't grind almost at all other than Mages, because there is basically unlimited bosses available, & with how bossing EXP scales, bossing is just better EXP. I can Tempest train at LHC which is faster than training most non-mage classes can do, however every level up I get that will of course get me less %/Hour while training (which is natural), but bosses Expedition bonus keeps increasing as I level so it's come to a point where it's a better use of time to do the "mid-level" bosses than to grind at the best possible location, & at a certain level even the "low-level" bosses will surpass grinding as the EXP they give will increase as I get higher.
Bosses get the most %/Hour, & they also get the best drops, there just isn't much value in doing other things. The big advantage I see with Henry's suggestion is that players will actually be doing a variety of things if bossing is limited. If the top players only do 5 bosses/day instead of 10~14 the separating factor between the top places will be grinding, so there will actually be Future Henesys/Twilight Perion grinding parties. I've found some interesting maps at those locations, but it would be a waste of anyone's time to come party with me as bossing is just better in every way.
As another note, bossing too much ruins supply & demand. Once a Mastery Book is passed, that's it. If 5~6 different sets of 6-man parties are running HT 2x/day, then Blizzard 30 for example will drop around twice/day on the server, once CHT becomes more common maybe closer to 3~4 books/day. Unless 1~2 players daily are becoming an I/L Archmage the supply/demand is just off & eventually the books become just throw always.
I think once a week is too extreme for all of these bosses, but the harder/higher level a boss is, maybe the less it should be runnable? I'm thinking something like:
Chaos Horntail: Once every 3 days (3rd to strongest boss, has amazing Pendant drop & needed for some of the better Sweetwater gear)
Von Leon: Once every 2 or 3days (Insane EXP, also needed for Sweetwater gear, too "leechable" (some level ppl just go afk >>>> hit boss like once or twice to get expedition EXP that feels closer to a 12x EXP server than to 3x))
Chaos Zakum: Once a day or once every 2 days (Needed for the more "meh" sweetwater gear, but sweetwater gear imo should still be rare/WOW lol)
MVPQ: Once a day or once every 2 days (It drops SCGs, feels weird for SCGs just to become a common "whatever" item)
Tbh even just these suggestions don't feel like enough, that's still a lot to do, but it's more manageable. Maybe I'll make my own post about expedition bossing percentages increasing w/ level, but it feels to me like at level 160+ there shouldn't be so much incentive to nZak/Scarga/Krex because you're "past" that part of the game, but with exp scaling it's still better to Zak (level 140 boss) at even level 190 than it is to go to Twilight Perion & grind, so it seems off. Level 180+ I feel players should be in a position where Horntail/CZak/CScarga/Wulin are now "meh" so that a typical day for say a 180~200 players is more like:
2x CWKPQ, 2x Toad, 2x TheBoss, maybe 4x APQ, maybe 4x GPQ, maybe 1x MVPQ that's it. Certain days Von Leon, certain days Chaos Horntail. Regular HT/CZAK should be obsolete enough by that level that a player would rather grind at Future Perion in a party than do the "middle level" bosses. I'm not sure exactly what changes I'm suggestions, I'm not good at being concise, lol.
Long story short, I agree with henry, though I disagree with changing those to just once a week, once a week is too seldom. Once a week for Empress/Pink Bean makes sense. Other bosses I think could be gradually less frequent than once a week starting at the top, then eventually allow 2/day on the "whatever" bosses.