First, Symmetra’s impact is at the start of the match and her being swapped right after the initial TP is extremely common.
Second, Symmetra’s impact in said ‘‘strong maps’’ is much less pronounced than that of Widow’s case, its nowhere near as pronounced, and her bad maps are terrible while Widow doesnt have terrible maps, just ‘‘not overpowered’’ maps.
Third, Symmetra’s impact on that couple of maps is exclusively due to team TP. If your team doesnt take the TP, build around it or build around Sym, Sym goes directly to F Tier. Such is not the case with Widow in any map or even most comps.
Finally, NO ONE wants Sym to be a team TP slave that has little skill expression and agency because of this… gimmick. People hate how mandatory she feels just for team TP, and Sym players from metal to GM HATE that her kit is gimped nerfed due to it maybe potentially breaking a map.
They are extremely different cases.