You can read a little more about these questions in the manual. The short answer is that MSFS 2020 didn't offer as reliable or user-friendly tools for managing scenery layers, but MSFS 2024 improved that situation with the Package Reorder Tool. In MSFS 2024, you should be able to either override, or not override both bespoke default airports and 3rd party sceneries with the Package Reorder Tool, right from within the simulator.
The only combination that might still require you to manually remove/rename a file from the Real Taxiways installation is if a 3rd party airport has its own taxiway sign 3D models, and doesn't contain any default taxiway sign record in the airport's scenery files. I'm not sure I've seen anyone complain about this, but I know there is the possibility for it.
Do my explanations make sense? I know it's a complicated subject, because there are so many ways to make scenery for the simulator, and an infinite number of combinations for how they might be layered. I'm happy to help you however I can to ensure that things are working as well as possible on your system, however! Let me know if you have any more questions.