And my point is that weight changes are not likely to have the economic ROI for their justification on a person-by-person basis

What you are suggesting is a very expensive late-training phase activity. It's also not clear anymore when fine-tuning helps or hurts. Progress is rapid

I see, I misunderstood your original message. Given how much progress has been made without it, It's perhaps not necessary especially if the economics make it prohibitive.