I usually use @Paul_Danyliuk method - an input table/form with a button that copy the data to the ‘main’ table and is disabled if the required fields are empty or have incorrect data type (e.g - text instead of numbers).
I like to use detail view to give it a form-like feel but unfortunately conditional formating doesn’t work there Conditional formatting visible in card and detail view so I list the missing fields in the validation message.
I might share an example in a few hours, whan I’m back at my computer.
Anyway, you can add my vote for this feature 