That's a very good question. Java and OOP really were new and exciting things when I first entered the workforce. But, I first started programming long before Uni and joining the workforce. I first started programming on one of these: https://en.wikipedia.org/wiki/Intellivision using an 'Intelliputer'. Then I learnt Logo on an Apple IIe. Then GW-BASIC on MSDOS, then PASCAL, then C. Then I stuck with C for a long time, including most of Uni.
So, by the time Java and OOP came along, I already had 10+ years of procedural programming behind me. That actually made it really difficult for me to to learn OOP. It was some weird paradigm that didn't align with anything I knew. So I gave Java a mostly wide berth for as long as I could and focused instead on Perl, then PHP.
Both of those ended up getting OOP abstractions crammed into them, so eventually I did end up learning OOP, but it was more through osmosis. By then Java had largely come and gone. As much as it saddens me, Perl too largely died. That left me with PHP which, to be fair, was becoming quite a nice language by then.
By now I was a devout OOP developer and really enjoyed the OOP changes to PHP. Python, being object based, was the next logical choice. Javascript was still a pile of poo. Then Javascript got OOP abstractions too and suddenly was all the rage. Then they started putting the frontend on the backend (Node) and I was truly lost at sea. To me it it was twice as much work to build something (API + frontend) compared to the old server side rendering. It seemed way to much effort just to avoid a page load.
Nevertheless, I tried React and I hated it, it made no sense - though Javascript was looking a lot nicer by then. So I held off a little longer on adding 'frontend dev' to my resume, then NuxtJS came along and here we are.
So, long story short, I've been doing this forever. I technically review team code all day, every day. I know good code, I know bad code and have seen shit that still gives me nightmares.
The funny thing is, I have written dozens of cool tools that I think are pretty damn clever, yet I have never open sourced anything. My reason is the same as yours: Because I still don't think any of it is good enough.