The author seems unaware of how well recent Apple laptops run LLMs. This is puzzling and puts into question the validity of anything in this article.
But economically, it is still much better to buy a lower spec't laptop and to pay a monthly subscription for AI. However, I agree with the article that people will run big LLMs on their laptop N years down the line. Especially if hardware outgrows best-in-class LLM model requirements. If a phone could run a 512GB LLM model fast, you would want it.
Uber is economical, too; but folks prefer to own cars, sometimes multiple.
And how there's market for all kinds of vanity cars, fast sportscars, expensive supercars... I imagine PCs & Laptops will have such a market, too: In probably less than a decade, may be a £20k laptop running a 671b+ LLM locally will be the norm among pros.