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A lot depends on what kind of app you want to build.
For my current side projects I am interested in two kinds of technology.
(1) ML-enhanced apps that involve sorting and classifying content. Here I am drawing everything in the back end and using HTMX to partially update the screen to, for instance, create modal dialog boxes. The point here is that I want to quickly add new UI tasks and it will not be so quick if a front end build process is involved. (Notably in my system you can roll out a new task on the back end without reloading the front end)
My back end is Python which I am souring on. The basic problem is that it does not have threads. So if I have a 1GB ML model and a celery with 32 processes I could waste memory with 32 copies of the model. There are ways of working around all this but if I was just using Java, one copy of the model could be shared by any number of threads. Java doesn’t have the ML libraries though.
The general principle here is that the vast majority of React apps are just ordinary form processing apps that could be developed using the methods we used back in 1999 and seem to have either forgot or never learned (if we are young.). You could make the case that DX and UX were better then.
(2) Virtual reality applications using
https://aframe.io/
here there is no back end. With these tools you can make a world that is browsable with an ordinary web browser but put on a VR headset and you are there. This is another counter to the boring React app because it is something you could never do with an frontendless site.