Why does Stopwatch/Zhonya's last 2.5 seconds? That's a long time in this faster meta.
Why not just round it to 2 seconds and maybe even give mages an alternative for armor that isn't either Zhonya's, Ninja Tabi or a pure tank item?
If there really needs to be any compensation for Zhonya's then just make it 100g cheaper or something; don't keep it broken. I just don't see why Stasis has to be as good as it is. It's not enjoyable to be unable to interact with a champion for that long only for them to consistently stun, nuke or pool out right when their Stasis ends.
and
will start abusing it, and their already hard enough to deal with