I don't think it's so simple as this. My view is that careful/dangerous is as careful/dangerous does, regardless of the art. I've never really struggled to not-harm my partners.
I've never had to pause mid throw in Judo to allow the other guy to take ukemi. In fact in Judo I've never really had to worry about the other guys ukemi, if I'm throwing him correctly there isn't much he can do so there's nothing to worry about. If the guy is half way though uchi mata he can't exactly say "Hang on, stop, lets do this more slowly; I'm unsure of the ukemi." It's a nonsensical thing to say in a judo context, which bit of "tuck head in, try to breathe out" does he not get?
In Aikido though I'm always having to adjust my technique to the abilities of my uke. I can go as hard and as fast as I like with people my level and above but I can't do that with people who are junior to me because I end up hurting them.