I am just really confused what their plan is:
trolls: it pretty much is a near-future loss for everyone that has to grind up the level and even at max level it is barely more profitable - only plus is that you do not really waste any combatitivty due to the 10h reload time. changes to droprate are purely positive, if I understand them correctly
Arena: no clue what the point of the arena changes is, but it literally is a random shitfest. sure it feels more competitive to not fight artifical generated enemies for 95% of the time, but everything reward-related is strictly worse than before. mojo is just super random as you only get mojo from enemies that are actually higher rank than you and you obviously can not choose who to fight. for pure-arena players it means less mojo as you 1. dont get a 100% win and 2. enemies dont always give mojo. XP gain was reduced drastically from 60-75 XP per 30 mins to 0-33 (depending on how many wins you get). the only plus side is that you get more money as you can fight trolls now. yes, you can use your combativity to go to the tower and fight for mojo-only there, but it will be an insane money loss - arena fights give XP, mojo and money, trolls money and tower fights only mojo
and generally you just lose out on a lot due to the fact that you have to check in every 30 mins instead of every 2h+
harem: changes to the harem basically only effect arena and the scaling formular includes negative square law which means it is terrible and not worth to spend much effort to level up girls after the initial easy-2-upgrade levels
to sum up: again a major change (PVP system) which was done badly. just like the affection upgrade with HH2.0 it only has negative effects for the players. the affection upgrade blew cost/affection, amout of affection needed and upgrade costs out of any relation and players who did not upgrade their harem before just got fucked. with the pvp system the XP gain got shafted and you can choose if you either want to lose a lot of mojo or money - if you chose the latter your outside-your-harem-income will be reduced to near 0 (i mean there is low incentive to go for mojo, but it still is simply worse then before)
EDIT: besides the fact that 'fight a troll' contests are pretty much a joke now as everyone is literally tied and whoever has the best timezone/earliest ID wins (besides the ones that hardcore cash for resets)