What you're saying is true now, but given the existence of grok-bot and similar dots (et al.) there is now an amassing amount of training data for "personal assistants" -- so in a couple of generations time, you'll find frontier models will be extremely capable in these areas.

Harnesses have been developed for this, and its also fairly trivial to do large scale verifiable-rewards post-training for "personal assistant" style things. eg., invent a booking website, invent a PA GUI-aware harness, and reward the model when a successful booking takes place. Do that 1bn times.