Even just for emailing, GMail at least is a terrible application on iPad. For examples, cannot format anything, or view one email while writing another (that isn’t a reply).
I primarily use mine for
* Note taking
* Browsing/showing PDFs in a construction engineering setting. Nothing is faster or as flexible.
* Sketching for construction drawings
But the lack of good tabular worksheet and emails beyond quick replies pushes me back to my laptop all the time.