Love it! I've been thinking about this a lot lately. It's crazy how many great FOSS alternatives are out there to everything – and while they might be relatively easy to install for tech-people ("docker compose up"), they are still out of reach for non-tech people.
Also, so many of these selfhostable apps are web applications with a db, server and frontend, but for a lot of use cases (at least for me personally) you just use it on one machine and don't even need a "hosted" version or any kind of sync to another device. A completely local desktop program would suffice. For example I do personal accounting once a month on my computer – no need to have a web app running 24/7 somewhere else. I want to turn on the program, do my work, and then turn it off. While I can achieve that easily as a developer, most of the people can't. There seems to be a huge misalignment (for lack of a better word) between the amount of high-quality selfhostable FOSS alternatives and the amount of people that can actually use them. I think we need more projects like yours, where the goal is to close that gap.
I will definitely try to use selfhostblocks for a few things and try to contribute, keep it up!
My guess as to why most apps are now a web UI on top of a DB is because it’s easy to “install”. SelfHostBlocks is admittedly geared towards a central server serving web apps. Or at least apps with a desktop or mobile component but geared towards synching to a central server.
Feel free to give it a try though, I’d love that! Also feel free to join the matrix channel UF you have any questions or just to get some updates.