This has been bugging me about the ArcGIS Pro UI. The Clear Selection and Delete Selection buttons are right next to each other in the Attribute Table (first screenshot) as well as the Attribute Editor context menu. It seems too easy to click the wrong one (I have done it, luckily I realized quickly and could rebuild the missing data). I'm using feature services so there is no option to discard edits later. I worry this is even more confusing for less experiences users.
Separating the buttons would help, at least making it harder to accidentally click the wrong one. I like the larger X icon from the attribute menu & ribbon, vs the less distinguishable icon in the table editor. The arrangement in the ribbon is also better where the delete button is removed from the selection tab. I never feel I'll accidentally click delete here.