I don’t think that’s too much - particularly if you know the individuals.
Though Sandro Hit might need a horse with a more active hind-leg (I’m not a dressage person so I can’t testify to this), I will say he himself has wonderful conformation, tight legs, and hooves. If you have a line with good mechanics, I wouldn’t hesitate to breed to him. And while they may be forward, as a female rider I like this - but that’s a preference thing. I also like some cockiness in a horse, SH has that in spades.
I always wanted to look into his gets soundness, as I really do think he can improve some of the issues modern WB’s have with dexterity. Have a few dressage-friends, and they find it very frustrating to have a horse who breaks b/w 8-12, when they finally have the training to get past 3rd level. This is the story over & over again. Wouldn’t be surprised to see SH the dam-sire of some very nice horses down the road. Not to mention, a horse that stays sound can sire more horses. Sure, might be a # thing, but you can not discount it.
Many stallions out there are not nearly as correct as SH - and you need some of his correctness, particularly with this trend towards extravagant front-ends. Nice to look at, until they blow tendon after tendon throwing those legs around. Just some observations, curious to see how they compare to all the dressage folks opinions.