For the 2nd point:
Mixing it doesn’t reduce it to 1fa - it still makes your accounts immune to Passwort leaks and common attacks
You are only at a 1FA level if someone hacked your PW-Manager but in that instance you’re most likely fucked anyway
Sure for the most important accounts having 2FA in another app is good so you can at least secure those if the PW-Safe leaked but I have 2FA on every single website I use(d) that offers it - even if I’m only on there once a year so using a special app is less important than just having the additional security in the first place
My kind of humour when one of the main reasons for switching to Firefox right now is the adblock