Totally agree. I hit another crazy iOS bug this morning I hadn't hit for a few months - search for an old email - specifically my old Ableton licence from 2022... Return to my inbox 20-30 mins later on that device and it's now full with every email returned from my earlier Ableton search. Open my email on any other machine (MacBook, iPad, etc.) and it shows correctly, but iOS will keep showing all those old emails until I manually move each one back to its original folder. Pretty annoying if they come from different folders, and deleting them deletes the original in the email account. Persists across reboots, so again clearly spotlight search borks out and wrecks the local mail index. It needs a "rebuild" button, like Mac Mail has to "solve" this.
If I took over Apple's software engineering, I would tell every engineer "None of you are working on features until a stock OS install has zero error/warning logs. No exceptions. Contribute to fixes or use your vacation time, but nobody touches anything until we get it all fixed. Then once that's done, nobody's allowed to work on features while there are open bugs in their backlog. No exceptions."