I'd highly recommend checking out alternatives. The one that impressed me (for a particular situation) the most recently is Clubhouse. Compare based on your needs. Enterprise needs with established products are not the same as a startup, as you know or will soon.
Yes, some companies prefer / require / demand self-hosted installations. Some do it for logical, financially responsible reasons too.
Numbers-wise (measured on a 'per company' basis), I would tend to disagree with the 'most' part of your sentence. Aren't there are many more 'smaller' companies happy to use hosted services as compared with companies that require self-hosted ones?
