You actually have to block more against Sim in V because there is no focus to negate his neutral. Don’t forget about that. Ibuki can full screen punish Yoga fire with kunai’s for free. A lot of characters can punish it for free on reaction, when it wouldn’t be possible with a horizontal fireball.
Bison can slide, Alex can elbow, Balrog can non EX rush punch, Cammy can non EX arrow, Vega can Slide, Nash can spin kick, Ken can step kick, Birdie can non EX bullhorn, Rashid can non EX eagle kick, Laura can non EX elbow. Don’t forget about just dashing to get into the deadzone or just simply dash and use a fast horizontal attack to punish on reaction.
I don’t see how SFV Sim fireball game is on par with SFIV. Don’t forget that he could Yoga tower to just rise above fireballs, it was easier to drill over fireballs because the hurtboxes were much smaller, he had 4 viable far normals to poke under fireballs, NJ.hp could punish and avoid a fireball from near 3/4 screen, his jump arc was better so he could jump forward from full screen and punish a fireball with J.hp, his teleport punishes were just as effective (just less damage), they covered the ground which setup his AA; ground; and TP mix-up game.
It doesn’t matter all that much how much range other characters normals have when they can just press st.lk and counter poke all four of Sim’s ranged normals.
His limbs haven’t been toned down slightly.
SFIV: St.hp-10/6/16 and -3 on guard.
SFV: St.hp- 20/3/22 and -6 on guard.
SFV St.hp can be punished by 4 or 5 different supers on guard.
SFIV frame data;
St.mk 9/3/14
St.mp 9/3/14
St.hp 10/6/16
St.hk 13/4/16
St.lk 7/4/8
D/Df.lp 9/4/11
D/Df.mp 12/3/16
D/Df.hp 14/3/21
SFV Frame data;
St.mk- 10/2/14
St.mp- 12/2/17
St.hp-20/3/22
St.hk-16/2/23
You could use St.hp, d/df.mp, d/df.lp, and d/df.hp to punish fireballs on reaction. In V, St.hp can only punish fireballs on prediction.
SFV Sim’s fireball and far normals are simply serviceable. I don’t think there is a single Sim player that would call them good, besides St.mk.