Well it's not looking much better, but it is at least readable. On Vanced, the fonts are white.You don't think but you are not sure. Any chance you could test it with the original YouTube app? It's dark in the original YouTube app, it's dark in the modded YouTube app, it's themed with some other substratum theme as reported by @Zgadnijcie , so it's not looking very good for your subs theme.
It's a bit drastic but it's still a valid solution. Thing with root version issues is that you can always go for non-root as well. But if you're feeling adventurous you'll find the apk (bundle) files needed for manual install on APKMirror.
I had the same issue. Fixed it by editing vanced.sh to change sleep 1 to sleep 5. (So in a root terminalIs there a working method in 2021 to prevent the constant uninstallation of vanced after an Android restart?
Since June until today I had 16.16.38 and somehow managed to (unfortunately forgot how. I think I did it via (LP+SAI) - but Vanced no longer offers apk for rooted Android ... oh yeah) that Vanced after the restart is not uninstalled. Today I thought I would update to 16.29.39, because I mistakenly believed that Vanced would finally have fixed this problem. Well, what can I say... Vanced is now uninstalled after every restart. Goddamn it, I'm going to have to grapple with this annoying ''feature'' again.
-LineageOS rooted, Android 9
sed -i 's/sleep 1/sleep 5/g' /data/adb/service.d/vanced.sh
Vanced is not on the playstore, for obvious reasons. The playstore is the standard android method of pushing updates. As for "in-app" updates, this is a mod of the existing apk not a full recompile from the proprietary source. And to be honest, I personally wait and watch whats happening on this thread before I venture out and install the bleeding edge update.
You can go either way. i5lee8bit has been keeping his mod that I linked you up-to-date in a fairly timely fashion. But of course he does it after Vanced releases their version. Both are fairly easy to update, in my opinion. Just depends on your preference.
I find non root suitable for my needs.