I've been using GoodNotes on my laptop using a graphic tablet for a while now, and the experience genuinely isn't bad. The features work as advertised, organization is easy, but it's still at an extreme disadvantage due to it being a web app.

It hogs resources like crazy and therefore drains battery, notes take a long time to even load and display a blank white page for a while, tools don't always work correctly, I could go on. They're minor problems individually, but they start adding up and eventually become a really, really big hassle to deal with. If you could give the idea of a web-version of GoodNotes some thought and maybe even follow through with it, I think a considerable size of your non-iPadOS userbase would be extremely satisfied.