As I’ve said before, from moto racing and riding, it’s just inherent that the front brake is on the right.
I’ve had hire bikes in Europe with them the other way around, you get used it but I’d rather not.
I like my dominant had to have the most modulation. Much easier to recover from a rear lock up than a front one
It’s a GB vs the rest of (most of) the world divide I’m afraid. All my bikes have left hand front brake and front derailleur, this comes from my South African days and it was the same in France.
I ask for all new bikes to swapped over and it still catches Mr out every time he does anything on my bikes. It isn’t that easy to swap over your cycling style to be honest. It’s not like driving LH v RH drive cars. The fundamental, “emergency”, instinct is to pull the brakes as you’ve always done - a car still has the pedals in the same order, just the steering wheel and centre console swap. Bikes sold in the UK legally have to be RH front brake, so 90% of bike shops are swapping for sale here. Then I come along and ask for it to be swapped back - it’s not the most complex job.
Depending if the frame is set up for one way or the other it can make for messy cable routing if you go against their intention. The front’s usually OK but the rear can need an extra big loop as it’s coming out of the wrong side of the head tube.
Bring British, and only ever having ridden British bikes, I’m obviously right lever for the front. I have ridden some hire bikes in Lanza - can’t recall if I just adapted or if they had some setup the British way
This topic has made me think about what the pros do however. Do the riders just state their preference, or do all British riders just learn the European way? The former would make swapping bikes a bit of an extra complication, so I’m guessing the latter?
I would have expected the pros have their bikes set up however they want but as you say swapping bikes could be a problem. In the middle of a race, tired, under pressure, swap bikes barrelling towards a turn and squeezing the wrong one is going to go sideways and right quick.