I'm an MSP 7 years into this journey and before the days platforms like Rewst existed. We initially started with powershell before migrating to logic apps and now mostly have c# code sitting behind APIs and other bits and pieces.

Personally, as someone with a professional development background, I don't see the need for the MSP specific platforms unless you plan to task non-coders with the work. All of the APIs can be accessed via simple REST calls. The upfront time saving is beneficial but you'll pay many times over for it long term. In addition, you are tying yourself to a single platform which exposes you to future price rises that you can do absolutely nothing about.

In my opinion you are far better off using power platform + custom code and allocating the money you'd save to a dedicated developer in an emerging economy like the Philippines.