Practically, PRC can simply mine TW ports, crater run ways, via glide mines and MLRS all within PRC borders (that can hit anywhere in TW + adjacent). US + co doesn't remotely have the demining, sealift or airlift capacity to logistically support TW off PRC waters. Nor will they convince any commercial fleet/insurers to go on suicide mission of... invading One China territory. It's like how Operation Starvation crippled JP during WW2. Except TW is much smaller than JP and PRC is a much larger industrial power than US during wartime. PRC can unilaterally and trivially render TW inaccessible - it can blockade TW with basically zero sustained naval or air effort.

And really if US/JP try to run the blockade they're legally invading Chinese sovereign territory and it's WW3 anyway. TW may have chance to survive a PLA invasion, but IMO no chance of breaking a PRC blockade. Folks are grossly underestimating the proponderous of advantages PRC has near her coast.