You can both appreciate Signal overall and be critical of some aspects.

What the user criticizes is due to sheer choices, which affect some users a lot; for example, numberless registration and full cloud backups can only be purchased with a Google or an Apple account, which clashes a bit with the privacy objectives.

And it's not a problem of not having the infrastructure to support other payment methods, since the donations support all the common ones, and there's now even a cryptocurrency integrated in the platform.

Disallowing and ostracizing other clients is a choice, they spent effort to enforce it (for example by adding mechanisms to recognize the official clients).

Hear hear. It’s been my observation that HN in particular has become much more combative. It’s full on like the meme where someone says “I like strawberries” and someone else complains “oh, so you hate pineapples?! They’re a fruit too, you know?! My great-grandfather ate pineapples. You’re a monster”¹. Yeah, chill, no one said anything about pineapples, stop assuming things or thinking everyone is against you. Don’t succumb to the tribalism.

¹ Unfortunately, I feel I must point out that I’m (I hope obviously) exaggerating for comedic effect.