Yeah stuff SSD array in TB4 hole for less money.

Yeah.

Obviously depends on people's workload. For myself and to future proof, I can see a benefit for 2TB locally.

The rest I can offload to network storage.

A TB4 connection is, for all intents and purposes, "local". Way faster than any network storage.

Indeed. I’m running on a 512Gb MBP 14” and have 310Gb free so no point in this for me.

Start editing high res video, and those TB's will quickly fill up.

That's why hard disks are still made and sold: they're an inexpensive way to achieve high capacity. I wouldn't expect seek latency to be problematic for video editing, and if it is, using the SSD as cache would likely be sufficient.

I have been purposely avoiding that situation to save money :)