No, it isn't.
You are demanding of App Store reviewers, and thus implicitly of app developers who have to satisfy review to publish, an equal level of concern with, and effort to support, the experience of the half a percent or so of users still on 4.7"-class devices, as with that of the 99.5% or so on everything else. This would require significant extra work in just about every app, 2x as much in some, probably averaging around 1.5x as much in most. That is not a reasonable expectation.
I've been in that half a percent myself, and I realize those with an attachment to remaining in that cohort will not find such an argument convincing. But I'm also, in retrospect, not really sorry that the last of the five 1st gen SEs I'd been carefully maintaining - four of which I'd bought used, three of which I'd replaced screens and batteries on - landed on its corner when I dropped it a year and a half ago, wrecking the sleep/wake button integral to the mainboard and well beyond any soldering skill I can acquire, and thus effectively requiring a complete replacement that I decided was finally no longer worth it. The 12 mini turned out not to be meaningfully larger or less wieldy than the 1st gen SE had been, and it's a lot more pleasant to use. There's value in not being actively, constantly frustrated by the experience of using my phone - especially since I do that every day for work now, too.
We aren't going to agree on this, I think, and that's fine with me. But I am going to say that I no longer have the sympathy for your perspective that I would have a couple of years ago. It's a perspective I shared for a long time, and one I put more effort into than most. I'm glad I did, not least because learning to fix phones has been useful. But I'm also glad for what I've learned since then, even though it's why I don't share that perspective any more.