I have a 992 GT3, so with that as the benchmark, my opinion is the Plaid handling is just fine for a big sedan, grip levels are very high and it's stable at speeds up to 130. At 150+ it starts to get a little light (two drag strip runs in my friends 2022, so not a world of experience) and I wouldn't want to do 200 in one... but it's a moot point as where can you do that safely anyway? Steering feel is ok, kinda numb but 99% of new cars are. Braking is an issue if doing repeated stops, but for one or two hard stops it'll bite down and with the stock rubber does okay. Obviously brake feel isn't there nor is ability to do repeated hard stops like in a P-car, so for mountain runs I'd look to upgrade the brakes as, given that 1020hp, you have to use the brakes a lot. Regular driving I just one pedal with regen so brakes are a non issue given they'll stop me in case of emergency (captain obvious here but summer tires essential as all season/winter increase stopping distance dramatically)
Long story is, unless you're tracking your Plaid or driving it like a total moron, you won't find the handling wanting from a grip or body control standpoint. But feel and braking and definitely better in any Porsche.