Hell, even some mediums (STB, UDES) do it's job more effectively, and not to mention the blatantly OP tier 10 reward tanks.
Why has the T110E5 been left to rot in the back line? The Super Conqueror does everything it does but better, hell now the M4 54 does as well. They buffed this tanks weakspot, decided it was too OP, dropped it down to 'meh' levels and then as the meta creeped forward thought "Eh, cba".
There may be worse T10s, but this tank literally doesn't fit any roll you give it.
Armour? Biggest weakspot in existence, primarily because WeeGee have refused to model the DM to match the visual model which would actually make it tolerable.
Speed/Agility? Just slap a turbo on an S. Conq, you don't have to sacrifice gun handling because yours is already better, and instead you get to move faster than a T110E5 with more effective armour – ignoring the M4 54, which has better gun handling, more effective armour, and better speed – even after the upcoming nerf, just stick a turbo on it, WG in their infinite wisdom thought mobility was the issue lmao
Firepower? A-la all of the above. It's good, probably the tanks only redeeming factor, but there's better firepower on other tanks with little to no downsides.
Honestly, shrink the cupola but still keep it easy to hit (Think M4 54s weakspots, so it actually takes skill to hit), or model it correctly so the angles of the visual model match the damage model, including the overlapping armour on the lower section.
The tanks WR is literally only 0.2% above that of the Type 5 Heavy… THE TYPE 5 HEAVY – THE THING DROPPED OUT OF META THE DAY IT WAS BORN!
And to answer your question, yes this does stem from quick-death match where I got sniped from 300+ by a 705A and 60TP into my cupola (YES, I was bloody wiggling), and the first round that went into my side damaged my ammorack. To top it off, I died to arty focus. Safe to say I'm a little peeved.
Source: https://www.reddit.com/r/WorldofTanks/comments/xw9gb7/why_do_tanks_like_the_s_conq_and_m4_54_get_to/