Author of Piped (and also a member of TeamNewPipe and LibreTube) here.
I haven’t seen any changes from YouTube recently, the ways we fetch age restricted content still seem to work for most videos. However, this method may not work for all videos as YouTube has different levels of age restrictions afaict. I’ve seen very few videos fall under that category personally.
If anything were to change in the future, I may consider implementing something similar to what this extension does (or use their API) in Piped.
Zorin OS, which was the second distro I ever tried, I hated how outdated their repos were since they were using an older Ubuntu LTS repository for packages. It was quite painful to install software that would otherwise have worked out-of-the-box on Ubuntu. I hope this is no longer the case today.