You said you average 50seconds for memo and execution. Let's unpack that. Assuming you get good scramble with no parity and no flipped edges, the average BLD solve is 4 cycles for corners and 6 cycles for edges. OP corners average 20 turns per face or 40 turns per cycle (two faces). That's 160 turns just to solve the corners. Then if one uses OP for edges that's average 240 turns to solve the edges. That's 400 turns just to solve a cube.
OK, you are using M2 and saving some turns. Straight up M2 averages 16 moves per cycle except 4 bad cases which add another 8 turns to every cycle. But that is mitigated by the really good UB case, so we'll only count 3 bad cases. So 16x6 plus 3x8 turns for bad cases. That's 96+24=116. 116 turns just to solve the edges using M2. 116+240=356 moves just to solve the cube using OP/M2. You said you do memo and execution in 50 seconds. OK, the world class, cream of the crop memo averages about 10 secs, Tommy Cherry averages 8 seconds for the memo. Let's give you the benefit of the doubt and say your memo is an incredible 15 seconds. That leaves you with a solve time of 35 seconds. 356/35 is roughly 10TPS! World class average TPS in regular cube 3x3 is about 8TPS. So, if you are being truthful, you have a TPS of about 10 TPS. Right? If your memo is 15 seconds then that's 11TPS, and if it's 20 seconds, your TPS is about 12TPS! That's cream of the crop amazing. OK, I have no reason to doubt that you are telling the truth and you have incredible memo and TPS. How many people are gonna come close to that?
If your memo and TPS is that good, imagine how much better you would be if you learned R2? If you took the time to learn M2 (Which personally I think is easier than OP. I taught my 9 year old son M2), you could have learned R2 as well. R2 and M2 are pretty much the exact same concept. It's as easy to learn as M2 because it's the same exact idea! Each R2 cycle averages about 16 turns as well, except the 4 L-slice bad cases which add 8 moves apiece, minus the one UL R2 case. That's 16x4+(8x3)=88 turns just to solve corners. 88 turns +120 turns = 208 turns. Already a huge drop in turns. 208/40 is a much more reasonable 5TPS to get to a 40 second solve with a 10 second memo. At 10TPS you'd be a sub 30 BLD cuber. If you know M2, you already know R2 because it's the same thing! Why aren't you learning R2?
OK, you said I'm exagerating the difference between 3style and OP/M2. Let's unpack that too. If you were to learn 3 style, you could solve every cycle in 8-12 turns a cycle. Let's average that out to about 10 turns per cycle because there aren't that many 12 turn BLD cases. (6 cycles x 10 moves)+(4 cycles x 10 moves). That's 100 turns to solve the cube (could be a lot less if you learn floating buffers, floating parity, cancellations, and a few 5 style algs). 100/10TPS gives you and execution time of 10 seconds and with a memo of 10 seconds you would average sub-20. You don't think there is a big deal of difference between Sub 50 and sub 20? 30 seconds is an astronomical gap in the world of cubing.