One of the main reasons we abandoned Pinta (https://github.com/PintaProject/Pinta) is we had to rewrite a significant portion of the app if we wanted to move to GTK3, as we had many custom UI needs.
See also:
GIMP, still on GTK2.
Inkscape released on GTK3 just within the past year or 2
Many comments (probably correctly) point out that SQL can't be displaced because it is ubiquitous and "good enough".
I wonder if there is room for a "TypeScript" of SQL that would allow developers to opt-in to whatever new language features or paradigms we feel SQL is missing.
It would then transpile down to regular SQL to be executed.
Ultimately there is very little consumer grade software anymore because modern consumers won't pay for software.
The only people who pay for software are enterprises and they aren't going to skimp a few hundred dollars on software that makes their $X0,000 creative workers X% less productive.
In this space there is basically Pixelmator and Affinity trying to eke out enough sales to keep their developers paid.
However, for some reason, many consumers will happily subscribe to SaaS apps. So developers go where the customers are.