Continuity features almost never work for me.Well, I use my phone most days for about 3 hrs screentime. I use WhatsApp and Notes and Photos pretty intensively, sometimes Pages, Books, Calendar, Contacts, Mail. The only bug I regularly encounter is that copy-paste between my ipad and my iphone doesn’t always work.
iCloud in general is constantly flaky. My iPad will stop synchronizing with my phone and iMac; mostly reminder notifications, but sometimes other things too. HomeKit automation is super flaky too. Instead of fixing it, Apple removed HomeKit hub functionality from iPad OS.