I don’t like the term “time gated”. It’s not a proper term for this kind of design.
Time Gating is a term invented to describe some systems in WoW, by people who didn’t know what they were talking about (as in they didn’t know the pre-existing common terms and decided to make one up). “Time Gated” has connotations of P2W mechanisms to it and is generally very negative.
Sym’s mechanics aren’t “time gated”. She has a “ramping mechanic”, or a “charge up mechanic”, or a “build up mechanic”. There are already a number of pre-existing, accurate descriptive terms for how she works. Please use one of those. Don’t try to adapt “time gating” here just because you don’t like how it works and want to smear it by using a negative term from another game (where it’s also being improperly used because…again…proper terms already exist).
So, now that I’m past that little nit-pick…
You can’t buff her stage 3 ramped damage. 200 dps is a very, very solid breakpoint that should’t really ever be bypassed with bodyshots. Not without some kind of massive, massive disadvantage of some kind linked to it to provide a counter-balance.
You have to understand, 200dps on an aim hero means that a pro with 70%+ accuracy will absolutely destroy with her. His team will build around that sym and pocket the hell out of her. You’ll have Sym pocketed by mercy, orbed and supported by Zen to max out that ridiculous damage as much as possible. Her only counter will be another Sym with the same setup, being pocketed in the exact same way.
Current Sym is pocket-bait. Her #1 limiting factor is friendly mercies not understanding their role in her performance. If you get your M1 up to level 3, you should be an immediate mercy target in favor of absolutely everyone else, and if you’re good your team should consider swapping their off-tank to a mei for the synergies that exist between both of your M1s (so, solo tank, triple DPS, and dual support with mercy pocketing Sym and Mei slowing everything down for the microwave).
Does sym need help? Yes, but more damage isn’t it.
Her teleporter isn’t useful enough for people to build strats around outside of Volskya and Hanamura.
Her turrets are less useful the higher your rank is, and it only takes gold or so for them to become totally useless.
Her M2’s RoF is absolutely abysmal. If anything deserves to have it’s ramping mechanic removed completely, it’s her orbs. She’s DPS now, but is still putting up with support levels of DPS on her M2.
Her M1 is a tool with a very specific niche in the game that can be used to great effect (especially against D.Va and Genji). Its damage is fine. Maybe reduce the ramp time and let her get to level 3 more quickly. She’s already one of the better barrier breakers in the game because she doesn’t need to waste time reloading.