That's the point. Sandboxed google play services has been the perfect expansion from GrapheneOS. I ended up using it since one year and I am really impressed how well it works. Perfect solution bringing apps relaying on google services within separate profiles. Love it!
Discussion
Wait, what are you using?
GrapheneOS with sandboxed google play services for separate user profiles...
As much as I admire what a lot of these companies I believe genuinely want to achieve, they have a lot of serious drawbacks and concerns, especially around how they market themselves when not in a commanding enough position to access the most appropriate and properly supported chips.
See this note covering the main players in this field.