LLMs aren't going to remove the "moat" that comes from owning specialized tools (sewer and drain cleaning machines, pro-quality welders, etc), and having a procurement and service infrastructure.

Individual property owners who want to dabble already have that option from the myriad YouTube videos available to them (and arguably they're more trustworthy than LLM slop), just as they've had with books and other media in the past. I don't see LLM-based trade "knowledge" as somehow fundamentally different.

Commercial service and construction isn't going to get put out of business any time soon by "dabblers" learning from LLMs.