I mean it does make sense to me here, he's often using his palm boosters and shoulder boosters to accelerate. Genos's flight speed isn't necessarily that much slower than his running speed, but he does prefer to run. You should be focusing on the fact that Genos is missing most of the boosters he uses to fly in this example instead of comparing flight speed and running speed, so I wouldn't be surprised if he's moving at 0.5% normal flight speed here or something.
You make it sound like I was critical of MHA for the mach 10 feat at some point? What speck in someone else's eye are you talking about? I haven't even mentioned MHA at all in this conversation...
In any case, although OPM is my favorite verse to scale, I say that our current speed and AP are extremely overinflated for most characters. However, given the rules of the forum the tierings can't be lowered that much from where they are, because we just don't scale to the lowest statements and smallest DC anti-feats when higher calcs are technically valid
If I ran the wiki like a GOD who went purely off generally vibes plus my own calcs with no outside input I would probably scale OPM-verse to, uh, this... also note the characters in paratheses are not really ranked in order, just examples of who I would tier where
C-class: 9-C to 9-B
B-Class (wolf level threats also): 9-B, with some 9-As that really should be a-class and Fubuki is an outlier
A-class (tiger level threats also): 9-A to 8-C, with outliers in 8-B (Kombu and Amai (base) in like 8-A)
Demon level threats: 8-C (low), 8-B (mid), 8-A to 7-C (High)
bottom tier S-class: 8-A (early PPP, Genos's first few upgrades, early Sonic)
Low tier s-class: 7-C (TTM, MA arc PPP, Suiryu, Council of Swordsmen, Pig God, base Metal Bat)
Low dragon: high 7-C (Nyan, Gums, most featless dragons)
Mid dragon and mid S-class: Low 7-Bs and 7-Bs (Base Bang, Atomic, Darkshine, Carnage Kabuto, VFU, Vaccine Man, Beefcake)
High dragon, high tier s-class: 7-A (Golden S, Rover's dura, Homeless Emperor's big kabooms, Elder Centipede, Sunblade, Flashy)
Above dragon 1: 6-C, 6-B (Platinum S, Bromance Metal Bat, 10 seconds Genos, Sage Centipede and EOW's AP)
Above dragon 2: 6-A, High 6-A (Psykorochi, Perfect Fist, EOW's durability, Tatsumaki, released Boros)
Above dragon 3: 5-C (Meteoric Burst, 4-Armed Garou, base Cosmic Garou)
BRASTU: 5-B physically, tier 4 with hax (Blast)
God: Tier 4 to Tier 3 (Cosmic Garou, Saitama, "God")