Couldn't agree more Tom !! Another reason why I ditched the SU.The Amal was a better choice Bc, SU's have a reputation for detuning at first opportunity. Volvo owners were cursing them back in the day. Some Harley enthusiasts in the States learned how to make their life miserable.
I grew up [ '60's ] with SU carbed vehicles and became pretty proficient in setting them up but as you say they were very prone to de-tuning themselves !
Fortunately back in the day Webers [ DellOrtos, Solex ] were plentiful and cheap and manifolds generally available for most popular cars.