Pointless? No. I mean you at the very least get the basic ideas, concepts, around the currently established metagame. The most common strings, frame traps, and Mix ups. The problem is the nuances that lie underneath the surface of the at face value game.
If you're an O.W. & go to a live in person offline event. This is what will happen. You'll respect things that online has taught you is safe on block. You could punish or in some cases FULL COMBO PUNISH but you don't due to the fact you have been trained mechanically something is safe. Same with the opposite. You could throw out something because to your knowledge. in 0% of all 4000+ of your online matches has (Insert string or cancel here) been punished. However offline YOU get bopped. I learned this from fighting DJT's fisticuff J.C. at Momocon a few months back. It felt bad man. I was like: "OOOH this gone" be safe... then b1212xxwhatever and then I never saw a life lead or a round win again. That and offline some opponents will do similar combos that they do offline but will nail you for about an extra 5-9% since the online latency forces them to do less damage due to online adjusted combos. Like with Quan Chi Warlock: Offline I'll do
B234, NJP, b2xxDB1MB, b2xxtrance, back dash ~ Jip f212xxdf1(scoop) 41%.
Due to lag.. I'll never hit the NJP so I adjust it to
B234, b1xxDB1MB, b2xxtrance, back dash ~ Jip f212xxdf1(scoop) 39%.
My Lasher Takeda for latency adjustment I lose an anywhere between 3% to 4% per combo. If I hit you with 3 combos and you're still alive... I hate you so much adjustments. Its bad man.
And we haven't even discussed if you're playing online on a non optimal TV/monitor setup. Adjusting to both.... on the fly? Better get AllState cuz right now you aint in good hands.