Besides, there's a lot of way to condition your opponent to give you oki (AKA neutral tech) now, honestly, with how easy rolling/not teching at all is to punish, especially in the corner. For example, Ragna can pick people up after Inferno Divider Drop kick with 2B or 22C (Midscreen or corner) should they decide to roll or not tech (for those respective options). This gives him a sort of forced oki. In the corner, Ragna can just meaty Deadspike on their wake-up to catch rollers or I-think-I'm-gonna-just-lay-here techers. Follow up with a good combo, and that's 4k meterless, 7k with 50 heat easy (and the combos really REALLY aren't that hard). This is gonna make people want to quick get-up or neutral tech pretty much all the time if they know what you can get for them deciding to do anything else. And (in this case) Deadspike is gonna force them to block. (You still have to time it correctly on their wake up, as they can just neutral tech through it, so there is a way around it, but that's not on topic.)
Point is, I'm not gonna say having oki is amazing, or that having oki is over rated, or any of those things. I'm just gonna say that what BlazBlue has honestly works just fine, especially since the game is meant to be a little easier than most fighting games. Sure, if they really wanted to balance something about this aspect of the game, they'd help give some of the characters with weaker oki better options, but as far as the teching system goes, it's just fine and quite easy to abuse.
If you have trouble with people rolling away from you or not teching, then find ways to punish it. That's what Training Mode's teching options for the dummy are for.
This being said, I like having oki. I'm just fine with this aspect of BlazBlue staying the way it is.