[bluGill]

These problems will happen in some form for every long lived codebase. In 15 years you will have some regrets, and some of those regrets will be things that are all core APIs used everywhere in the code base and so impossible to quickly change.

[Capricorn2481]

Isn't it 100x worse in C++ though? Because the surface area is huge? I work on legacy apps but PHP 5.6 is not that fundamentally different from PHP 8.3.

[bluGill]

No, it is nearly the same - most problems are your own making because of your own lack of foresight. (perfect foresight is impossible)