I guess that's part of the issue...big "if"Cromper wrote: You don't need any cleaning draws either, just take the damn swing it's perfectly safe if you know what you are doing... .
I recently heard about someone that smashed their belayer into the boulder (on Ro) because they forgot to unclip the belay end of the rope when cleaned bolt #1 and took the swing. Experienced guy, ,maybe just tired at the end of the day and not "vigilant" enough according to third hand sources(?). Maybe it was even this accident(???)
Last time my partner told me the swing was "way" safe (not Ro, another crag) I ended up going way far into the trees...I was ready for it--having done my own mental math that said it would be closer than I'd like====and got pretty scratched up still, but it could have been really bad. So sometimes even with the "best" assurance from an experienced partner you're best off with a leaver//fifi//bouldering up to #1 depending. OMMV....
...the other factor on a swing is the coordination between lead and belay on the "landing"...have seen this sequence botched several times, and been put down pretty hard myself once or twice from someone that was in (my opinion) too big a hurry