I have a 2020 p500 and ride mostly dirt roads. I like to run around 10 to 15 mph and usually 4th gear. Is lugging at lower rpms ok on clutch. I'm not talking valve rattling lug just lower rpms.I also run 27 inch tires.
Yes that would make sense if his is a 2020 and it's not kicking down automatically then he has got no worries.Can't do that on mine; it downshifts on its own even in manual. Mine's a 2018.
If you're really lugging it, it'll downshift by itself. So you're good!