If you're wearing normal clothes when you may be in a self defense situation, training where your clothing can't be grabbed and controlled is more unrealistic.
When you start training in the Gi you find out how much control someone gripping you clothing has, it feels like they're cheating. This isn't the realization you want to come to when a big guy grabs you by the shirt- "no fair, you can't do that!"
Judo is far less effective than Wrestling/BJJ/Boxing/Muay Thai when it comes to actual fighting.
Yes you can get grips on clothing but it's not great and you are just entirely depending on the assailant / combatant wearing thick, long sleeved clothing. Otherwise a t-shirt collar will likely rip or not provide an adequate "collar grip", and you're just shit out of luck if someone has a short sleeve or tank top, or takes their shirt off / has no shirt on.
Simple as that. Like I said I'm a BJJ guy mainly and I do gi and no-gi but obviously the gi is way more sport and way less realism. Not everyone has a thick ass collar and sturdy lapels for you to latch on to. And again let's revisit the efficacy of Judo in MMA, not too great.
Judo performed well is beautiful, it's awesome. For the 3rd or 4th time, I think it's one of the better martial arts...it's clearly not a "fake" or shitty form, but at the same time it's simply not as effective in "real fighting" as wrestling, superior striking forms, and BJJ are. It's cut and dry.
To also repeat,
again, I am responding to the initial claims of Judo being some ethereal spirit form that requires no strength/power. Yeah okay. I just don't fuck with delusion, strength / size matters...it simply does. End of story. Technique is king but there's a limit where strength/size trumps it at an adequate level of training obviously. The best Judoka in MMA is Rousey, let's see her toss a LW male, never.
Edit: Best* = Most successful Judo player in MMA was Rousey, obviously not the best considering male sport I would safely assume is much more technical / superior. Is what it is.