Plus the code I wrote myself isn’t usually what I have a problem whith changing. It’s the various included packages and dependencies that in some cases may no longer be supported, and may not even have a similar replacement. I usually deal with this when updating an old web app that uses the Laravel framework. Some Composer packages are locked in to older versions. And when the client has a 20 hr/month budget, these types of updates can be tough to fit in the schedule.