With those devices, you shouldn't need a product-specific app. There will be edge cases and some interesting implementations which actually need the extra features of course, but in general, you should be able to connect them to a dedicated bridge device or a home-assistant server and that's it. Those can update the firmware of many devices if needed and should expose the available devices as switches / dials / colour selectors.
I mean, ideally you buy a thing, connect it to your existing controller and never see anything with the company logo or their app.