In the case you mention, you've made a tradeoff to defer developing an in-house solution for supporting a potential future pattern of production traffic, and that can be a huge accelerator.

Further, once you're experiencing the types of success that demands a superior solution the priority to invest in such a solution is clear.

It isn't "lock-in" - there's enough experience and capability in the market to solve those problems _once you have to_. Solutions like this let you decide whether the right time is at start-up or scale-up.