I don't have or want a Google or Apple account. I use a de-googled android phone running Lineage with MicroG. I'm glad for Unified Push because it means i can now get instant message notifications for supported apps, without which I would need to rely on SMS which can take up to 15 minutes to appear.
I am not willing to compromise my ideals. It there were no unified push, I would just live with delayed notifications of SMS, but this is better.
edit: corrected that I would have no notifications, not delayed notifications without unifid push.