MK9 = All 3 bars, lose it whether it hits or not
MKX = All 3 bars, lost it whether it hits or not
MK11 = No Resources, Regens if blocked or whiffed.
The only thing you forgot to mention is X-Rays weren't one time only. You could land one in Round 1, then lose a round ('meter building round' LOL) and land
another one in Round 3. Boom, you could score about 65% percent damage (without komboing into it) out of the 200% you needed to beat someone. FB is one time only (as far as damage goes) and you can steal
only one round. No resources but you have to be low on life so it's limited in a way. If you're better than your opponent, you'll win eventually. If not, it's not only because of the FB.
I played a Kano in the last days of FT3 Ranked. We were evenly matched but I lost the first two matches to his Fatal Blow. Was it annoying? Oh, of course it was. Was it my fault? Oh, yes it was. I poked both times and he punished me twice for it. Then I pulled myself together and reverse 3-0'd him and won eventually by making better reads and punishes. My experience shows that FB territory comes down to patience. You have to be patient with pulling the trigger and wait for the right moment on the offensive and you have to be extra careful as the defender.
I'll admit it to anyone anywhere that Erron and Geras has great FBs (Kabal, Cetrion and Noob too) but these are tools. It's so satisfying to suck a Jade in after the bitch was running from me during the whole match doing air glaves but it has to be a read, timed perfectly with the right spacing. It's not
that free. Erron takes it one step further, and it sucks when you duck his FB, melt his life from full screen, he's on last breath and his FB comes back in the last second but whatever. Yeah, I lost it.
Characters are different for a reason. If you want level playing field, take away all the OP Fatal Blows, take away Scorp's teleport (those friggin cancels...), Erron's half screen jump kick, Cage's FB cancel option, Sub-Zero's meterless freeze, Sonya's MKX mix, Jacqui's cancels, an so on. Then you'll have the exact same characters and it will be boring AF.
IMO the more tools the better. You can win by it just as you can lose to it.