I've been trad for nearly 10 years and going wfp next week or so.
However, I'll still squeegee my shops.
1: It's a more reliable result : You can see straight away if you've done a good job.
2: I'd rather not leave water everywhere in the high street : It looks untidy.
3: It's not worth moving the van every few yards down the road, and parking on pavements isn't good.
4: It's quicker on single panes to squeegee.
5: I don't want to lay hoses around the public.
6: It looks better I think. I sometimes get wolf-whistles, as do most manual workers, but I don't think they'll do it when I'm brushing away. It doesn't look skillful.
6: I like squeegeing!
7: Actually, I think that's enough reasons.