Its basically petrol heads who prefer manual transmissions, I doubt any of them have economy in mind, I have a manual transmission on my hilux EV conversion unless I'm going uphill or have a big load it stays in 3rd from start to finish
I also think EVs tick a couple of boxes that manual gearboxes also do for enthusiasts, which slushbox autos didn't. Always being in a good powerband and engine braking are both features of EVs and manual gearbox ICE cars that I miss if I am in an auto ICE car.
If I have £15,000 in the bank, spending £8,000 on the manual vs. £9,500 on the automatic (Renault Clio, 5 years, both on motors.co.uk) is significant. I'd choose the cheaper car.
If I have £50,000 in the bank it's much easier to justify.
(And if I have only £8,000 or less I don't have a choice, but I might tell my friends I "prefer" not to put a lot of money in the car.)