These things is like having spur heels which makes walkinn harder, reduces balance, wearing shoes more uncomfortable and also causes much pressure on the heel which may cause ulcers in skin.
Also, the added height to the heel is not real height. You take 2/3 due to the angle that the foot takes. So by adding 2 cm (which is too much and will cause the problems I mentioned) your real added height is less than 1,5 cm.
These surgeries is a complete crap.
You can have the same effect by adding 2cm insoles to your shoe, not to have an added heel spur that will cause many problems, no real benefit and costs 5k euros!
For extra height, except from LL everything else right now is a completely bs.