Self hosted may as well be on premise for most companies though.
The whole point of SaaS is that someone else manages the app. If you've ever worked in an enterprise you would understand that it can take months/years and significant amounts of money to get an app "installed". Often there needs to be a business case, project and resourcing plans, security and risk reviews, legal compliance checks etc.
The infrastructure (cloud versus on premise) is just one part of a dozen and not usually the most challenging.
The whole point of SaaS is that someone else manages the app. If you've ever worked in an enterprise you would understand that it can take months/years and significant amounts of money to get an app "installed". Often there needs to be a business case, project and resourcing plans, security and risk reviews, legal compliance checks etc.
The infrastructure (cloud versus on premise) is just one part of a dozen and not usually the most challenging.