Im gonna lay out a buncha opinions and things i've noticed regarding crits on Blu in the time ive spent on Panda jb over the past week compared to my extended time on SG's jailbreak.
I don't buy that it would be too easy for red's without crits. Would it be harder? Sure. But I spent a year+ as admin and player on SG jailbreak which didn't have crits and was even more rough for Blu with less leeway on rules and the like. 90% of the time Blu's stomp reds simply because they start with weapons and can much more easily coordinate. Without crits blu's were incentivized to listen, pay more attention, and actually cover potential paths of escape (barring secrets).
As it is from what i've seen, many blu's simply dont take the game seriously on Panda, or don't actually cover the paths reds can take to escape. They seem to rely on the maps where the cell area is unforgivingly linear for Red without much potential for sneaking away. They also don't get punished nearly as hard for being bad guards from what i've seen. It's pretty common that guards freely bait and block reds with little to no punishment, and since any time a red hits a guard they get marked as rebeller, warranted hit or not, they are most likely going to die.
As it stands, there is practically no reason to rebel as certain classes on Panda. Why rebel as heavy when every blu can 1 shot you from outside of your own effective range. This is an issue even without crits, but crits only make this type of issue even more drastic and punishing. If you aren't a spy, sniper, or scout, you might as well not rebel or wait for the blu's to just carelessly off themselves.
Now, in matches where you have 20 reds and only 3/4 blus, I dont think crits are as big of an issue. They can only reasonably watch so much ground at once, but when you have 6 or 7 blus? Even without crits there is no reason for them to fail other than just being bad at the game or unware of secrets.
Minicrits might be a good middle ground, imo, but crits are just too powerful and it baffles me how Panda gives blu even more power yet they seem to perform even worse. I genuinely think without them, Blu would be encouraged to pay more attention and be much more cautious around reds.