Same thing happened to Nest. The cameras and thermostats were great when they were a private company then sh*t the bed when Google took them over.
Google stopped support of their app almost immediately in support of ‘Google Home’ which was to control the thermostat and Camera - which is terrible and requires you to constantly log into it with your email and password if you want to access anything.
I went with the BezosBoxHomeAsssssistant. … it sucks too. The challenge to my mind is that it’s hard to make any profit on these things, so it’s hard to spend the dev and server $$$ required to actually make the systems do what they should.
I don't think I've ever had to log into the Google Home app, it just uses the accounts on my phone. Or is this some sort of situation where, "I'm too Android to understand this problem?"
Having your Google Accounts linked to your phone is the same as being logged into them at all times. I believe the person you're replying to might not use Google Account integration.