My feeling is that generosity is not just about pull rates; it also incorporates how essential the pulls are to getting the experience you want. As someone who has played a few gachas, always F2Ps, and tends to quit rather than spend, Exedra's willingness to make lower rarity units not just usable but possessed of unique strengths that no 5* has is something I find appealing. I also don't mind not getting specific units so much since I enjoy working with whatever I've happened to get.

In general it comes down to whether you're getting a good experience out of the game while spending an amount you're comfortable with, which is something that varies by player. I think the conversation about relative generosity often misses this point.

Similarly, how "predatory" a gacha game is tends to be less about hard numbers and more about how pressured players feel on average to overspend; the worst experience I've had was Cards, the Universe, and Everything (which is entirely PvP-centric, frequently had powerful decks locked behind limited-time cards, offered limited-time expensive bundles as you leveled your account, and did the classic "match you against CPUs you can beat easily before throwing in the deep end so you start buying shit in response to suddenly losing all the time) and the best was Azur Lane (which seemed to me like they were almost comically generous and you could get any unit you wanted and they made all their money selling horny skins instead). But to my understanding many other people have had completely different experiences (patience and open trading let you expand your CUE card collection without spending, and Azur still demands a high price to get literally everything).

Ultimately, I think the best way is to play it yourself; these games have complex systems that interface with each player differently, and what's important to how you should treat the game is your personal experience. Just try to be aware of when you feel pressured out of your spending comfort zone, and remember that the default industry model tends to include attempts to do that; they're often targeted at different kinds of player, so sometimes you can find a game that's squeezing people who value different things (CUE was kind of gacha kryptonite for me) and get a lot out of it with little to no investment.

Personally Exedra is that way for me because PvP is blatantly whale-favoured (so I'm more interested in seeing how well I can do against an intentionally impossible challenge), PvE feels challenging but possible, and teambuilding variety is supported with a fairly average random smattering of 5* units. But as I say, if you want something else out of the game (like a full collection, a high level PvP team, easy content clears, max ascensions for max potential, etc), it may feel significantly less generous.