I've just had a windscreen replaced by Autoglass, first class service.
However, it reminded me of an option I had on a car in the 80s, an Escort Ghia, which had a heated windscreen. (It may have been an Orion, I had one a little later.) I've not seen the option on any of the cars I've had since- admittedly not Fords but all 'decent spec' cars with other gizmos.
The Ford one was excellent. The wires were very fine, you didn't notice them unless you looked for them, and it it worked vary well.
Why didn't hadn't they 'caught on'?
I knew someone who had his standard screens replaced on his new vehicles (VW vans used for business) by a localish company, so I assume after market ones are available- at least for some vehicles.