Yeah, I have been in calls like those. Despite me pushing for "can you show me what your product can just do?" I kept getting "Please tell us what you want first" and that finally culminated into a follow up demo call. The demo was super generic and nothing I said (except 1 item) was really considered).
Frankly, by the time we were done I was zoned out and doing other things.
If the CEO had considered to demo in the first call I would've almost pushed to buy it right away but at the end we decided we'll just do a light weight solution in house with a few devs
Not that this works all the time. But the point is to listen to your customer instead of just taking a single approach and sticking to it