Why dont we just remove the HMG and Heavy suit from the game?

Reading your post Bormir1r I can only conclude that you have not played an HMG Sentinel long enough to have any clue what you are talking about.

Reticule:
It is not as bad as it was in the old days, but I still have to get the dot in the centre of the circle on target to apply full damage. You can remove the outer circle completely for all I care. All I need is the dot.

Turn Speed:
With and HMG Sentinel if I am attacked from behind I will be half dead by the time I get turned around, and checking my flank is a slow process. The weight of your weapon effects your suitGÇÖs turn speed, so the HMG is slowing our turn speed already. It already takes us 2 seconds to check both ways before crossing the street.

Range:
The HMG had more range before they fixed the dispersion. In the old days of what I call the GÇ£Precision HMGGÇ¥ I once got an HMG kill at 60m. Now I have trouble applying DPS to people on the other side of a street unless I switch to an Assault HMG, and then I am sacrificing Close Quarter DPS.

Heat Buildup:
Not even mentioned. The balance mechanic which is there ready to use, and you never even mention it.

Thankfully CCP Rattati has some understanding of the Sentinel Class. Heat Buildup is the obvious way to balance the HMG, if any balance adjustments are needed.