The site above gives a good exposition on all the weaknesses of these horrible things. The poor contact aspect is not to be underestimated. There are various kinds of universal socket and one of the versions not shown barely makes contact with the earth of any but one or two plug types, and of course not at all on Schuko or French plugs. I wouldn't like to pass more than an amp or two through most of them.
The BBC article is of course written by a non-technical person, who makes a number of mistakes in the article whilst labouring his political point. For example, the pin spacing of French and German plugs is identical as they are both based on the same standard, the 'curious small 3-pinners' that BS1363 supplemented are still current and do not date from the introduction of electricity, etc etc.
Anyone interested in the variety of plugs around the world should take a look at the
Museum of Plugs and Sockets run by Dutch enthusiast Oof Oud, who is much more clued-up on the technical details! On there, amongst the British eccentricities, you will see dissected not only
the 'Fittall' but also
the 'Crater' which is an earlier and better piece of engineering designed for all six standard British round pin types. Had the BBC man researched his piece at all, he would have realised that there is more to this subject than two bent bit of brass that just about touch the side of his laptop plug pins.
FWIW I was on telly in the 1980s, scary thought that, talking about my plug-design-to-end-all-plug-designs. The IEC effort was just getting off the ground so it felt hopeful, and my concept was new and better. I'm sort of glad it never came about, variety is the spice of life after all!