There are arguments for not changing spears that i don't understand. Please keep in mind, that i talk about 2h spears. Spear and shield is mostly okay, besides of glancing to easy
Spears are good as support weapons
Well, they are, if you are in a 2vs1 sitatuation. And balancing a weapon on 2vs1 doesn't seem right to me.
If you are in a 2vs2 fight, you can usually have 1 stab at your buddys opponent, until you will get facehugged. People are not keeping on distance, and wait until you stab them...
So you have this first stab, and after that, you're useless, as soon as someone is decent in blocking or brings a shield.
Spears are used in skirmish
Are there really people, that play skirmish with a 2h spear? I can't really imagine that. 2h weapons needed a shield to be able to play skirmish, cause there were useless. And for some reasons, spears a capable of a fightm though you can just attack from 2 directions, have to maintain disctance and doing lower damage, than a 1h sword? Compare it directly to 2h weapons. The only "advantage" is the extended range. And this range is not even extended, it's shifted, cause you lose this range on the other side in close combat. A 2h weapon is faster, can hit easier because of swings, does more damage, can fight close quarter, can use feints, has 4 attack directions AND has crushtrough. So why 2h needed a buff to be able to compete and spears do not?
Spears vs cav
In my opinion, spears don't need a buff against cav. They need a chance to fight back. I have absoluty no problems with killing cav, but i also use the spear as main weapon.
Side swings
In my opinion, this is really needed. Those swings don't need to do much damage, it's mostly for mixing things up, and gaining some space in close combat. For me, it would be even enough, if they wouldn't do damage, but pushing the enemy a bit back so you can gain some space
Hit boxes of shields
One big problem i see with spears are the extended hitboxes of shields. I don't know how often i stabbed someone from the side on a part, that was clearly not covered by a shield, and i was still blocked.
For what i'm seeing, spears are not used by people. At least not in TDM or siege, i had whole games there withouth seeing a 2h spear. Very few play with shield and spear, but compared to all other weapons...