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don’t know why you’d want to? you may trust your dns server but without dns over https the dns requests themselves are sent plaintext and are vulnerable to man-in-the-middle attack. with dns over https the dns requests are encrypted and that encryption would have to be broken for a MITM attacker to see your requests. more security is better and dns over https costs virtually nothing to use in terms of cpu resources.
edit: oh do you mean whole system mullvad VPN? if so, then yeah dns over https doesn’t really help much but it’s also still a case of why bother turning it off when there’s no benefit to it.
yt android has been buggy as fuck for me. randomly disconnecting while casting, captions stopping halfway thru a video and the button for them greyed out until i disconnect and restart the app, no tab buttons at the bottom when i first open and it goes straight into shorts instead of homepage until i back out then restart the app, sometimes when trying to watch a video on the app and not casting it just straight up refuses to play not even showing a buffering symbol just the play button like a static image. it’s gotten ridiculously bad.