Code is maintenance heavy and tends to have interdependencies on other related code. Eg, I wouldn't use qt4 today because it's dead, so if something is wrong wi

Code is maintenance heavy and tends to have interdependencies on other related code. Eg, I wouldn't use qt4 today because it's dead, so if something is wrong with it it's now my problem to figure out how to fix it. Meanwhile qt6 is under active use and development, so I'm much more likely to find help and bug fixes, and developer interest. And it's less likely to say, stop building because cmake deprecated some ancient feature, or uses some ancient and now incompatible library.