Folder upload on Drive requires Chrome. In general, using Chrome adds features to Google sites, through proprietary code.
Unlimited music downloads used to require a Chrome plugin. Many Chrome plugin APIs are private. Now, it requires music manager, which ONLY gives you the option to download everything, not the specific albums I've bought. Chrome is also the worst browser to put on a laptop. Mine never idles while Chrome is up. So I use Firefox instead.
And while you said "that you could before," it's still garbage that Google won't publish apps for WP. While people may speculate that iOS only has Google apps because of market share, it doesn't quite fly since the iOS apps are usually better than their Android counterparts, especially Hangouts.
AOSP is a skeleton of what Google ships on Nexus devices. And not in a good way.
Android itself still has quite a few rough edges. There are enough moments where I don't get the option to expand the volume slider to change a specific volume that it's annoying. Seeing and changing defaults is literally hidden from the user due to piss poor UI. On a tablet > 8", Android is worthless.
While I admit I'm on an old phone now (N5), Marshmallow still has plenty of jank and lockup. I shouldn't have to still throw specs at Android, they've been slimming it down since 4.3.
There is no API for launchers to have the Google Now page on the left. Devs are too slow to take advantage of the new features of the OS. Why should I have to wait a minimum of 3 years for 6.0+ to the majority OS before my apps back up their data by default?
I admit, the freedom of Android is still really nice. I have Tasker set up to the point that I rarely have to adjust volumes at all, yet I still run into issues on the rare occasions where I do need to change a volume.
But missing that freedom would be alleviated by an x64 Surface phone. A lap-dock with dedicated GPU would be icing on the cake. I'd gladly move on from having a play computer in my pocket to a real computer in my pocket. The Ubuntu phone not getting funded back in the day was one of the biggest missed opportunities in mobile tech.
It's not that Google's services are horrible. They're not. But the lock-in keeps creeping in, and it's getting annoying, especially in regards to Chrome. It's such a resource hogging piece of bloatware.