OFSO - I guess what you're actually pointing out, is that the latest plug-in AC to DC PSU's now use electronic switching to perform the current conversion, as compared to the old transformer stepdown/rectification setup.
Yes, it's true. In the drive to eliminate cost and weight - electronics, and ever-tinier electronics, now rule the world. Yes, they do seem to run hotter than the old transformer style - but I like the compactness and weight saving for when I'm on the move.
I also like my new handyman inverter welder. The comparison to my old 140amp transformer welder is amazing.
The old welder weighed 50 kgs and I grunted every time I shifted it about. The new inverter welder is 200 amps and weighs 7 kgs.
The inverter welder welds better than the old tranformer welder, with a more stable arc.
Whether the inverter welder lasts 30 yrs like the transformer model - well, that's an unknown.
I never trust any current conversion device - even transformer PSU's can go on the fritz and start a fire.
I have a policy of treating all AC to DC PSU's like 14 yr old daughters - I never leave them unchaperoned.
I switch all my PSU's off when leaving the house, or when I go to bed. I've seen too many house fires where a small plug-in PSU was the suspected cause of the fire.