I don't think it's necessarily two fundamentally different personalities (unless I have multiple...which I might...)

I grew up taking things apart, and I loved the courses where we build logic gates or modified compiler or interpreter code.

I now build things on the shoulders of giants.

But when I need to, I know I can dive to the deepest levels to debug something, or I can write or customise any part of the stack.

It sure is a mindset shift and a context switch. I consider choosing the right moment to switch approach to be one of the most important and hardest tasks of developing software systems.