Software is software. Why would the age of the software have anything to do with making changes?
Because the underlying operating system, web server and libraries are in continuous flux with security updates. Most of FR is implemented in PERL. Changes to the underlying language implementation and feature support can cripple a large code base.
One of the ugly parts of modern software development is building on a pool of library code from a broad set of contributors. A defect in any of the underlying libraries can break your code. Mandatory fixes to a library can impose a significant re-work of your existing application to deal with the changes.
I retired from 46 years of software development. My project code bases ranged from 250,000 lines of code for a small project to over 4 million lines of code for larger projects. The big ones were spread over 10 different languages e.g. Ada, C, C++, FORTRAN, Java, JavaScript, PERL, shell (Bourne, C, Korn, Bash), PL/SQL, Makefiles and broad sets of newer build tools. Managing the complexity of customer demands as well as security scan demands is a serious amount of work. People who can play at that level and have the security clearances as well are not inexpensive.
Having answered your question, my two "wants" for FR include being able to delete a post I have created or edit one to fix an error. I recognize those are significant tasks as I've done that for my many customers of my career.
Show them how its done!