I agree that this should be looked into by Google. I just bought the Nest Camera Outdoor Battery and its only available in the Google Home app. In general this is fine but there are significantly less features. I want to tell the new camera what times to turn on and off but can't in the Home app yet.
Unfortunately, the new Google Nest cameras released in the last couple of months cannot be accessed from the Google Nest app or from the home.nest.com website via your browser, but only from the Google Home app.
You can read Google's perspective on this (and customer reactions) on these two blogs in this forum:
Thank you for your feedback on this issue, I fully understand the frustrations of not having your new Nest Cams in the Nest App. I can imagine having to use two different apps at the moment is quite daunting, and could lead to frustration.
However, the new Nest cameras and doorbell are exclusive to the Home app because we wanted to create an integrated experience with your speakers and displays. A Nest Aware subscription applies to all of your cameras, speakers, and displays in the same home structure. Thank you for your continued patience, and support. I am more than happy to assist you further with this inquiry if you wish. Please let me know.