Coming from Teespring and recently at Figma, I’ve seen both sides of this problem: home rolling a teeshirt maker in canvas and also trying to use parts of an editor at Figma for marketing (wasn’t decoupled enough). I’m excited to see where this team takes this and grows.
Thanks for the kind words.
From my view, the hole in the market is not customer support and features requests. Fabric.js and konva (that is used inside Polotno) are "low-level" libraries. They are providing a DOM-like API to the canvas. That is it. In order to make a full canvas editor, you have to write a lot of code on top of fabric, or konva, or any other library, or SVG.
https://polotno.dev/ - is designed to solve a very narrow business need. So you can build a full editor with much less code (almost no code at all). It may be less flexible, but it is the tradeoff for solving one problem in a good way.
> Fof non-commercial or development usage only
One thing I found myself needing: Is there a way to manage the z-index of your layers? (e.g. send layer to back, etc)
Using Firefox on Manjaro.
error -> pdf export doesn't work as intented when canvas size changed. scales page elements to fit predefined (I think) page size.
Consider (down the dev road) export options that optimize the image, like https://tinypng.com/ (I have no affiliation w/ them, other than as a user).