I'll give you the example my meetings procurement contact gave me. Let's say for a seminar for 200 people you need in addition to your plenary room, 6 breakout rooms. Let's now imagine the hotel only has 5 but would be perfectly able to use the plenary room as a 6th breakout area, or sub-divide another area in order to make a 6th breakout room. It wouldn't be able to mention this type flexibility on a booking website, so if it said it only had 5 breakout rooms available the booking engine wouldn't pick up this venue, even though it would be perfectly capable of meeting the requirements. Having also organised meetings and seminars myself, I know that there are some for which I'd need to explain to a person what I'm looking for and get some options. For other simpler meetings however, I could do it easily on a website with a credit card.