So my question is why did I set up two seperate services for this?
Unfortunate side effect of buying someone else’s product instead of just making your own.
can I reply to incoming emails from the aliases created in proton pass without them revealing my address?
Yes. It’s called a relay for a reason. When you receive an email it will come from a relay address, not the actual sender. You reply to that relay address and then the other party receives your relay address (alias).
If it were about one app, and you could do that, I would be inclined to agree. But it’s not and you can’t. It’s about new bullshit constantly being shoved down your throat.