It’s great if they space the episodes out on a weekly basis, as that is an indication of how good a series is.
If it’s uploaded all at once, often means it’s a bit mediocre.
My opinion only of course.
I have no objection to their being screened weekly, but why not give viewers a choice to watch them on the 'catch-up' channels if that's their preference?
I don't like the fashion for screening things on consecutive nights either. I can almost never be free to see them three nights in a row, and there is no time to catch up before the next one goes out. Some of them (eg the Woman In The Wall) give you the worst of both worlds, with two consecutive nights, then a gap before the next ones. Who runs their diary around TV schedules?