You lose security, sure. But you are gaining so much more ease of use. Bitwarden autofills your credentials and puts your token into your clipboard. Also it syncs your tokens to all devices. Effectifly this makes a site as easy to login as a site without 2fa.
The alternative is on desktop always get your smartphone, open some app type a token or on the phone to switch to multiple apps to get your credentials. Not fun imho.
I currently activated 2fa on over 60 sites, I doubt I would use it as much without BW.
For me, the key benefit of 2Fa is getting more security against leaked, stolen, phished passwords, and that still holds up.
Locus is a commercial application from a small czech company (around 10 employees). Pricing is overall fair and they work hard to get wishes from the users in the app. But I can understand when one wants to prevent using apps which are using google services.
An open source app which goes in a similar direction is Osmand+ which is on fdroid for sure https://f-droid.org/packages/net.osmand.plus/
Good points!
I got the vault protected via yubikey of course ;)