Not an expert but i think theres 2 issues.

1 there is no real asic resistant algorithm it think. I beleive Any algorithm can be turned into specialized circuits. The way something like monero does it is by changing the algorithm periodically but that leads to issue 2

2 it's a bad idea because it reduces the incentives of miners. Right now their investments are only recoupable by hashing. The more a machine is general purpose the less the requirements to specifically serve the network.