I've never heard of the 3/2 rule but certainly knew about two spaces after a full stop.
When companies tried to change it I was told that companies were trying to get reduce it down to one as a result of one company - I seem to have either BT or British Gas in my mind - wanting typists to increase their output. Mind you that could be a complete urban myth. I do think it helps people read more easily with two.
Did secretarial training in 1969 - but not in the UK. Was never taught double spacing after full stop. None of my bosses or colleagues ever pointed it out to me either.
The two or three spaces is definitely a typing/secretarial thing. In the print, only one space is used. It's hard to change habits and I can't see that it matters for viewing on a screen.
I was taught the same way in my secretarial course. I still do two spaces after a full stop, couldn’t do anything different now! I thought everyone did!
Whether two or three spaces, it is not so much out of fashion as no longer necessary unless you are using a typewriter rather than a computer. Perhaps Jacob Rees-Mogg will be reinstating typewriters in his office.
I taught myself to type from a Pitman’s book about 1967 and learnt to put 3 spaces after full stop and 2 after semi-colon, like you, Lovetopaint. I still prefer to put 2 or 3 spaces after full stop, though I know it’s out of fashion.
In 1956 and 1957 I was being taught shorthand and typing at my Central school in London. We were taught then to leave 3 spaces after a full stop and two spaces after a semi colon. It was second nature to me and although I retrained later on the habit continued. Now I read in the news that Reese-Mogg is instructing his staff to use 2 spaces after a full stop. Is there anyone old enough to remember the 3 and 2 rule?