Organizations and individuals tend to oscillate. Often they do a "build" project that goes badly, resolve they are going to "buy", then "buy" goes badly and they are going to decide to "build" next time.

It would be a mistake to assume that either "build" or "buy" is automatically superior in any given situation.

What I will say is that the vendor has a team of flying monkeys that will spread FUD about "build" and the other vendors because that is the marketing message that moves the needle.

How good the product is really depends on the mental model it is based on. If the mental model is right it will be excellent but if it is wrong you are in for a world of pain.