You can disable bloatware apps, even ones that don't let you disable them. The trick is to connect with ADB, and then use 'disable-user' for the app, which will disable it for just one user, but you only have one user on the phone, so it's effectively the same. I used that on a Samsung a while back to disable all the Bixby junk, among other things.
Google should really crack down on making it impossible to disable apps. OK, maybe they'll insist you have a web browser, but only block disabling the current default app, so you can kill the preinstalled app once you've switched to another. And if you try to disable an app that you can't, it should say something like, "Sorry, you can't disable Bloat Services because it is required by 'Phone,' which is the default app for receiving phone calls." Once you change that default app and disable the apps that depend on B.S., you would be able to disable it.