I'm not so messy, however they may be doing light base and then dark trim as it already looks and thus a little extra paint on the trim isn't a big deal.
My style would be prime everything with exterior primer, thus making it all white, and then paint the base siding, if I slopped "a little" on the trim, so what? But as I say I probably wouldn't be so careless. Then when I paint the trim, it'd be all set regardless.
My sadder part is, if the trim was to be white ... well ... "Primer is white
" And then I'd be extra-extra careful on the base coat.
If they sprayed that, and looks like they did ... they went hogwild. Whatever. So long as they resolve the trim in the end.
It looks crappy now, but also looks like an aged house too. And maybe the owner is doing the project. Myself I barely have enough time to mow the
lawn weeds. Exterior painting and finding good weather during non-work hours are incompatible things in New England during Spring rains. Then we snap into Summer temperatures overnight and everybody just wants to head to the beach.