Exactly! For the Chromecast at our cabin, the fact that people cast from their own phone is a feature. No shared logins between families staying there, no need to log in and out from some additional device.
Yup, I agree. They really should not have called this "with Google TV" thing a "Chromecast" in the first place. The earlier Chromecast devices were so simple and extremely pleasant to use. They did their thing extremely well. It really felt like a bait and switch when I unboxed this and plugged in. It doesn't even show up as a cast destination in YouTube when not logged in while every single Roku in the house is there and does what the old Chromecasts used to do. To be fair a remote for pause and volume seemed like a natural addition, because that had been a bit clunky with the older Chromecasts when doing like family watching. I also really liked the Chromecast Audio while it worked. After this "with Google TV" thing Chromecast moved from one of my regular recommends to family etc to never being mentioned.