I mained old Sym and i main the current Sym as well.Both version had pros and contras,but the current version have the chance to be buffed into viability even on high ranks.
There are a few issues with her but fixing them isnt hard. Her main problem is basicly what you yourself stated, she dosnt have a proper role.
She is not a support and definitely not a tank, yet for some reason she have an enormous shield as an ultimate which is just wrong on so many levels.
Unleashing a few moving double HP turrets around her for a few seconds would be a more suitable ult as a close range DPS.
The contradicts continue, she is primarily a close range DPS, yet she dosnt have any utility to help her survive,other than that clunky,unreliable,slow teleporter and she isnt strong enough to kill her enemies fast enough either.
They could take 2 direction on fixing her:
1: Rework again, and make her kit help her survive, right now even Torbs overload but with shields would benefit her more than the teleporter.
- If she is to stay as a close range DPS (because of her left click range), but without any change to her survival capabilites, then she NEEDS to be dominant af on close combat. Making her gun charge way faster or do more damage to begin with is the only way to do so.