Tim Watts wrote
Rod Speed wrote
Tim Streater wrote
Tim Watts wrote

And in the old days, we mostly only had BC fittings to worry about...

Yes, what is it with this screw-in **** that seems to be creeping in?

Its basically a better design.

Unless you have metal casing forming the main socket screw thread,
and you use it in a country where polarity is not guaranteed - eg
touching the lamp neck (eg whilst unscrewing) gives you a shock.

Of course, modern designs use an insulating thread and a
contact near the base - but BC have never had this problem.

Occasionally, I have found ES resistant to unscrewing resulting in shearing the bulb base.

Sure, but you can get that with baynet sockets too.

And they have the other problem, they are less mechanically solid too.