

Affinity is a one-time fee at around 80€ for a Photoshop, InDesign and Illustrator clone that sprang unto existence literally to combat Adobe subscriptions. Except since using Affinity exclusively for a year now, it feels better than Adobe ever did. Much more modern. Only missing a rare few of features that have work-arounds.
But, as OP says. Linux support is sorely missed. Because it’s much smaller than adobe there is a lack of community effort to get it to run on linux and if you manage to make it run, it craps out on you.
Since I work professionally with digital art and print, Krita, GIMP, etc. are sadly nowhere closer viable options (I have tried). Unfortunately I had to give up and install Windows last week solely to run Affinity properly, all other software that I use for work runs smoothly in linux, and like 95% of my preferred games (I too refuse to pay a subscription on principle).
I’ve written a few articles in LibreOffice and the things I need to be able to do just can’t be done in order to follow the structure of the zine I was writing for. It’s a hobby zine and the work is free by everyone so they just reformatted it for me; but it still inconveniences others when things aren’t within a certain expected standard. I do blame microsoft for it though; all office apps uses the same standard except microsoft, unfortunately all the users uses microsoft office…
and no, krita, inkscape, gimp, etc. can’t replace Affinity. Affinity itself could barely replace Adobe in their first place. but it still has, for many. so it’s not a learning issue. Affinity is more intuitive than Adobe, so in this case Adobe is just outdated.
but as for the open source, the issue is more than just a lack of features. The UI is at least 15 years out of date.
Professionally the software just isn’t there; and it’s a real shame too, because I feel very uncomfortable using ANY microsoft products (on principle). But as far as Photoshop goes, there is photopea which is a great free browser based clone. Sadly there is no illustrator or indesign browser based clones that can match the quality of photopea, and the only desktop apps up for the job of matching Adobe is currently the Affinity Suite.