I like how Wally had to change costumes after joining the team. His suit was just not practical in any sense of the word. Batman took one look at it and redesigned the entire thing.
Obviously they added the stealth tech (because the suit is bright yellow and red) but they also added knee pads, shoulder pads, elbow pads, padding on the thighs and calves, ventilation slits on his chest, a zipper on his cowl, storage compartments in his gloves (to hold energy bars) and high tech goggles with night vision. They also got rid of the lightning bolts he had on his hips.
It's pretty obvious that the left version of the suit was made and designed by Barry to be Flashy (pun intended) and aerodynamic but not much else. The second Batman was technically responsible for this kid he outfitted him with an entirely new tactical outfit.
Wally is the only one this happens to. Batman added stealth tech to everyone else's outfits as well but he didn't change their outfits. Kaldur has the same outfit before and after joining the team. Wally was the odd one out. Which is fair. He was in neon yellow spandex.
That's why Wally sticks out here the most. The rest of his family just wears spandex or jeans and a shirt. They have zero tactical gear whatsoever.
Even Bart, after being on the team, only gets stealth tech added and nothing else.
Wally has compartments because he needs to refuel. They others don't. Wally has tactical goggles for recon missions. The other speedsters don't do recon.
The other speedsters don't wear padding because they don't get hit. They don't need any protection. Their main tactic is to throw a punch and be out of range before their target even registers it.
Wally isn't fast enough to do that so he had to actually learn how to fight. He also learned acrobatics to avoid being hit. He is surprisingly flippy when you watch him in fights.
One of his main tactics is to physically ram into people at top speeds. His go to move is to use himself as a human cannonball.
It's very apparent that he doesn't operate like the other speedsters. His suit and fighting technique are so remarkably different than what the other speedsters have and do. You can tell that he's had to make up for his slower speed by supplementing any training he got from Barry with the training he got from Batman and Black Canary. Barry taught him to control his speed but he didn't teach him how to fight.
Even Bart, who literally had the same training and also had stealth tech added to his suit, doesn't do any of this. At most Bart has rubber grips on his gloves and tactical goggles and that's it. Zero padding, zero armor. It's all just aerodynamics.
His fighting technique is just "hit things at superspeed and dodge". Sometimes it's "run really fast in a circle". He's clearly been trained in a different way because of his speed.