So I'm not saying that if Plarium makes events they should half-ass it, on the contrary. Make events that players want to participate in. One way to achieve that is to give good or at least reasonable rewards to the players for completing events.
On the other hand I think, and I want to emphasize that this is only my opinion, there is a basic flaw in the discuccion of players leaving Raid because of the bad event rewards. So these things a called "rewards". It has an implication that you need to do something extra to get them, hence they are a bonus, a reward. It means that if you don't do that extra you just simply don't get that reward, you're not losing resources, nothing of the sort.
Most of the times these rewards can be and should be accessible through farming. Just a few exmples: chickens - you can level up food, tomes - (this one hurts, because it's kinda meh) can be "farmed" by getting the chests from CB (mostly NM and UNM), artifacts - there are 4 dungeons for that, energy - well, it's always good to have more, but usually energy is the first reward you get, if you just put in some work, so for me acceptable, soulstones - robot something dungeon (not doing it, I heard it's bad). So 90% of what you can get as reward you should farm anyway, which means that if your main income of artifacts are the relentless sets you can get from tournaments, or something like that, you're not really playing the game.
What cannot really be farmed are champs. Most of the champs come from shards, that's undeniable, but here comes the twist: the whole base of the game comes from the excitement of pulling shards. Is this format pay-to-win? Absolutely! Can u play f2p? Absolutely! Will it hinder your experience? Well somewhat, because it's going to slow down your progression, but it doesn't stop it.
So I have a question in the end: would you play tha game without the events as well? If yes, this doesn't need any further discussion, if no, then maybe you don't like the base gameplay itself, which is natural, so try it wothout the events(don't do them), and see how it is.
Ah, but Plarium should really think about these reward things. They are not compelling enough to make the players participate in events imo, jsut another to-do, and that's what bothers a lot of players.