If Taylor hasn't certified the Kytch product to safely integrate with the Taylor product, it seems reasonable for Taylor to say it could cause problems. If they said it will cause problems, that seems a bit different.

It could cause problems to your already broken machine!

Considering they are connected to each other electrically, yes!

No, because it's already broken. That's the point that was being made and you are not addressing that here.

Your car's broken: oil pan needs to be replaced and it's in the shop. $2,000 repair.

While it's in the shop, it falls off the lift: $10,000 damage. Now your formerly "broken" car is even more broken? Is the situation still the same?

What sort of argumentation is this? You know full well that something broken in one regard can be further broken in an unrelated regard.

Hmm. If Kytch will never certify 3rd-party products, isn't it still irresponsible to say it could. The moon could be made of cheese if nobody checks.

Irresponsible? I don't know, maybe? What responsibility does Taylor have to Kytch in the first place? Certainly no obligation to say "Their product is safe to use on our machine."

Defamatory? I don't think so, but I guess the courts will decide.