Take a look at Affinity Designer. I’ve found all the features I needed, and it’s been just as simple to use for me. While they don’t yet specifically list Bug Sur compatibility, the product is popular and in active development.
As a long-time Intaglio user who was thrilled with the app, I’ve finally accepted it’s abandonware for whatever reason. I definitely got my money’s worth, and it was a great app - but I had to move on. I hope all is well with the developer.
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