O-I Exp's firepower compared to similar guns on other heavies

Source: Redditor HeinrichVonDoucheber

TANK TIER DAMAGE RELOAD
O-I Exp V 300 9.69
ARL 44 VI 300 10.69
T-150 VI 300 10.20
T29 VII 320 11.41
AMX M4 45 VII 300 9.60
T32 VIII 320 10.60
Tiger II VIII 320 10.40
VK 45.02A VIII 320 10.10
110 VIII 320 10.00

His words:
So here is the table with comparison of reload time on O-I Exp and other heavies that have guns with similar average damage. Reload times were taken from wiki page, which accounts for fully trained crew, and no equipment. So O-I Exp beats all those tier VI, VII and VIII tanks except AMX M4 45, which reloads just 0.09 seconds faster.
I just don’t see what is such a gun doing in tier V. If it had horrible penetration or huge reload than you could say it’s compensated by that, but it doesn’t, it has excellent penetration for its tier and it reloads faster than 3 tiers higher tanks. It can 2 shot other heavies in its tier with AP shell, and since it has excellent penetration you don’t even have to aim at the weak spots. Tier V and VI games are infested with O-I Exp and O-I, there is not a single game without at least 1-3 of those per team.
here is the more important comparision to the other t5 heavies (made by Redditor killswitch247):

 

TANK HP ALPHA DPM 30 sec damage 60 sec damage PEN Accuracy Aim time Dispersion Gun depression
Kv-1s 122mm heat 660 370 1995 1110 2220 140 0,56 2,78 22/22/18
O-I exp 700 300 1935 1200 2100 130 0,39 2,49 20/20/16 10°
Bdr g1b 650 240 1580 960 1680 135 0,38 2,40 30/30/16
Kv-1 85mm 640 160 2002 1120 2080 120 0,40 2,78 25/25/16
Kv-1s 85mm 660 160 2002 1120 2080 119 0,40 2,40 22/22/13
Churchill I 700 135 1759 945 1890 145 0,35 2,21 20/20/20
Vk3001h 660 135 1689 945 1755 157 0,33 2,40 22/22/20
T1 heavy 660 115 1998 1035 2070 128 0,41 2,21 24/24/16 10°
Kv-1 57mm 640 85 2312 1190 2380 112 0,33 2,21 25/25/14

His words:
the problem with the o-i experimental is that it’s best in class or a close second in all important stats. it isn’t weak in any way to balance out its strengths.