I used the 3pin on the Hyundai ioniq I had previously when staying in a holiday cottage that was miles from the nearest charger.
Like wise !.
There are a lot of rural area's of Wales, when public chargers are very few and far between.
I used the Granny for about seven months on my VW PHEV back in 2016, before getting a wall box installed.
I then retired the Granny unit and only carried it, when we where going away for short breaks.
For this reason alone, it is this situation the Granny can be an absolute God send !.
We have now had two full BEV's after the PHEV and now the Granny units are pretty much used as holiday back up, or if the wall box develops a fault / failure.
Case in point, my brother has recently upgraded his previous ZS EV Gen 1 to the newer Gen 2 model.
After using the wall box for almost two years on his Gen 1 it then suddenly decided to stop working after having his new Gen 2 for only about 3 weeks.
He is blue badge holder and only has the one single mode of transport.
I received a text on Xmas eve, asking me for some advise, as he was in a bit of a flap TBH.
With only about 60 miles of range left remaining on the GOM and wanting to use the car over Xmas to visit family.
In his stressed state, he had completely forgotten about the Granny unit stored in boot..
Five minutes latter and he was up and charging once again, a lot slower but still charging !.
What a complete life line that was.
His wall box is still under warranty and a call to the company who had done his install, was diverted automatically and it was answered by the boss of the company on his mobile while on Xmas holiday !.
His company had closed down early for the Xmas break and would not be available to make a house call until the new year.
THIS IS A GOOD ENOUGH REASON ALONE, TO HAVE A GRANNY LEAD AS BACK UP !.
Not everybody is in striking distance of a public charging post or a rapid unit to grab a charge, but almost every home has access to a 13 Amp three pin socket outlet.
If you have a wall box at home, then yes your Granny lead is likely to find itself in early retirement.
BUT in this case ............ When you need one, BOY do you really need one !.
If your EV does not have one, then just BUY one, would be my strong advice.
Just ask yourself this question :- "If you found yourself in the same unlucky situation as my brother, what would you do then ?".
Owning an EV comes should come with an attitude that you should try and adopt, always have a back up plan !.
From a spare wheel, a type 2 public charging cable, to a 12 volt booster pack and a 10mm spanner, at the least ? .