I can't say I like this characterisation!
A marketing message devoid of any useful details is really one that's devoid of any real indication as to whether it will work in your business' context. And let's be honest, the magic silver bullet that works flawlessly out of the box doesn't exist. It's never that simple.
If I need a product that does SAML2 or OIDC auth and $vendorA clearly advertises their support on their product page, but $vendorB has no detail available and wants me to talk to someone in sales and set-up a "demo and chat" where it might well emerge that there's no support for a feature I absolutely need (or the sales rep will have no idea what I'm talking about), I can tell you straight off the bat which vendor I'll see more favourably.