Becoming more and more unusable from upgrade to upgrade

Hi @Fugu I cannot confirm at all the issues that you are describing (maybe due to the lack of a detailed explanation and examples of what you are encountering).
If you read this 2 treads linked below, in case of issues, it is suggested to share sample projects and upload diagnostics, among other things:

About your “selective upgrade” request I cannot help, unfortunately.

But about you issues: there is certainly a reason for them. That can eventually be solved or mitigated, sharing here on the Forum the required informations, so probably without needing to downgrade:

can you share a sample project (to have an idea of the size and complexity of it) with diagnostics?

examples?, sample projects?, diagnostics?

which library? sample project? diagnostics?

circumstances? diagnostics?