[IshKebab]

Picking up and sorting Lego with a robot arm is pretty much a state of the art research project (a few years ago at least), not a hobby project.

[Grimblewald]

Depends on your defenition of hobby and if the hobby as part of it being enjoyable needs to produce something tangible in the short term. Following sota research, tinkering, trying new things in a field unrelated to your day job can be a fullfilling hobby.

[Terr_]

I imagine it is strongly affected by whether the pile is already decomposed into individual bricks or not.

The analysis and disassembly of a combined set of bricks can frustrate even human eyes, brains, and fingertips.