Yes, if you don't mind the latency and throughput restrictions of Thunderbolt. Eg. Apple's M1 has a memory throughput of 66GB/s, which is an order of magnitude

Yes, if you don't mind the latency and throughput restrictions of Thunderbolt. Eg. Apple's M1 has a memory throughput of 66GB/s, which is an order of magnitude more compared to Thunderbolt 40Gbit/s. So it's more like a really fast SSD instead of a local memory upgrade.