As a heavy Working Copy user, with all the respect I have for its great developer, it is just a bad UX; Buggy, slow as hell, and you need to constantly wait for it as you can't minimize the app as the dumb iOS will kill it.
SSH via Blink is also not a very good experience (the keyboard is buggy), but it's good enough. The problem is when you want to do some local stuff, e.g., play some multimedia file, or do some expensive computation that your server is too weak to do. Only a fool pays +1000$ for a dumb terminal. (Of course, artists have their apps, and they are the sole group who are served by the iPad Pro.)
I'm not a huge fan of Working Copy's UI, although to be fair to it, I find a lot of desktop GUI Git clients to be pretty arcane as well. My experience with Blink has been pretty good on the whole, though. In any case, I was focusing on iSH specifically -- I'm just not convinced that "when I run this terminal program which is a clever hack to allow console Linux apps to run in x86 emulation, it's a poor experience" is a great argument against the iPad's utility. :)
But, I'll take gentle issue with
> the sole group who are served by the iPad Pro
I also know or know of writers, photographers, DJs, musicians, and podcasters who do a lot of work on iPads. It was my only portable computer for over a year, and the one I took with me on sometimes long trips. I got real, genuine work done on it, and I am not an artist. I have my complaints with it, to be sure (you might notice I'm using past tense there). But I think the HN audience has a bias toward "ease of use as a development platform" as a primary measure of utility -- which happens to be a measure that the iPad does very poorly on. That's an understandable bias given that audience, but it's worth poking around and seeing what "iPad first" power users are actually doing with their iPads even with the occasionally maddening limitations baked into iPadOS.
SSH via Blink is also not a very good experience (the keyboard is buggy), but it's good enough. The problem is when you want to do some local stuff, e.g., play some multimedia file, or do some expensive computation that your server is too weak to do. Only a fool pays +1000$ for a dumb terminal. (Of course, artists have their apps, and they are the sole group who are served by the iPad Pro.)