I know what you mean about 'old-fashioned weeding'. I used to do that myself.
In my view, a number of things have changed.
Many 'gardeners' wouldn't be able to identify a weed. And even if they could, they wouldn't want to be bothered with such tedious faffing around. They believe that the easiest way of dealing with 'weeds' is by applying various herbicides - selective weedkillers, lawn 'improvers', glyphosphate, etc. This is what adverts on TV tell them.
That TV advert for the Fiskars Weeding Tool carries an interesting and appealing message - that people should be able to do weeding, using a machine, while wearing their best clothes, and without bending down or getting dirty.
There are also some intelligent arguments against weeding.
There are some schools of thought which suggest that soil should not be left exposed - that it should be covered by something, preferably plants that you have chosen to grow - ground cover. Also, soil disturbance encourages weed germination. And does 'cultivation' actually improve the soil, or not. These are serious questions.
I'm also becoming more aware of the places of indiviudal plants, including weeds, in the ecology of the garden. At one time I didn't give a thought to the essential role of nettles, or thistles, or fungi. Scientists still don't fully understand how all of these plants work, and what their particular functions are. Many plants that we still think of as 'weeds', presumably have some unique role, which we don't understand.