Clear, direct and so I agree with you but.... there is a "but"... you can become a slave of outsourcers when the things doesn't go as you like in the beginning of your adventure.
During the first launch period, the outsoucer should be flexible to follow you in a win-win opportunity, otherwise the fixed monthly costs can kill your business when it's not grow-up enough.
If you choose an outsourcer, you cannot chnage so quickly as you like... you cannot cancel training, agreements, working process, human connections so quickly... and remember that each time you must start again with a new outsourcer, you must value the internal and hidden start-up costs.