I loved the Warhammer 40k sets and the LotR sets. Didn't care about the others. Other people loved the FF or Avatar. Different people have different tastes (everybody hated Spiderman though).

The canonical MtG lore is not exactly deep and refined anyway.

On the other hand, the Final Fantasy set release was the most fun I’ve had at a pre-release event. Personally I’d have preferred Dragon Quest with some sweet Toriyama art, but you take what you can get. I met people who had stopped playing MTG decades ago but came back for the pre-release to see some of their favourite characters. Good conversations. I’ll also say that while in the big scheme of things of course FF MTG was a financial decision, the bulk of it felt like a labour of love in the sense of “how can we translate this FF idea to MTG” with some awesome results. Cards like Overkill¹ and the concept of summons² (a mix of creature and saga). They also made sure there was something for everyone. All FF were represented, go get your favourites.

I didn’t attend the TNMT pre-release but had fun speculating on e.g. what colour each turtle would be. Within the constraints, I think they got it right (even if Sneak VS Ninjutsu is unnecessary complexity). I’m curious about Star Trek too. I can imagine four or five legendaries for Rom³ (a secondary character) alone and they could all coexist.

So yeah, they’re doing it for money and I do think there are too many of them, but at least they’re not half-assing it every time and are letting the designers really work with the possibilities. There’s only so much you can do with a generic fantasy setting.

¹ https://scryfall.com/card/fin/109/overkill

² https://scryfall.com/search?q=%28type%3Acreature+type%3Asaga...

³ https://memory-alpha.fandom.com/wiki/Rom