Can you say a bit more about the problems you are seeing. Apps should just work on new versions of macOS, except on the odd occasion Apple introduce breaking changes such as removing 32-bit support. Big Sur is a bit different as it's also the first version of macOS for Apple silicon Macs, but that should not make any difference to it running on Intel CPUs (though it might explain why they've not released it yet).
But apps should just work, and normally do. Can't think of anything in the OS that would cause problems.