personal opinion, i think padding is worse for delineating objects than a bit of colour; or just, like, a line. look at this example - there are four distinct segments on the left, whereas on the right they all merge into one and a half
padding is really useful, yes, but if you put padding on everything then what’s there to be separated?
i wouldn’t even mind the colours if they didn’t tint the background. tinting solely the main text colour and the main buttons might look quite nice. to be honest though, i just loathe pastel colours in general, so it’s possible that’s influencing my opinion