Shaving off a couple of years means nothing. Wally was the same age as Barry because Barry was dead.
Barry does have his own niche. Using new concepts added to the mythos by Wally does not change that.
Wally used Barry's villains and wore his costume. If anyone is being hypocritical it's Wally West fans for being ok with Wally using things created for Barry and then being annoyed that Barry does the same thing with Wally.
Wally West's whole existence is built on Barry Allen. As mentioned above, he wore his costume, used his rogue's and lived in his part of the DC universe.
The idea that Barry has relied on more from Wally than Wally does from Barry is a lie and frankly makes me wonder how much Barry Allen Flash you have read.