Is it normal to be considering redesigning absolutely everything you've already built?

hey all! Title.

So I just recently hit Phase 4. I only just discovered the power of trains (I thought trains were in Phase 4, oops). I used one mega factory for space elevator parts, and mini factories for just about every other part. I'm also on my very first playthrough (technically second but I quit before phase 2 the first time)

And now I'm considering ripping up and rebuilding just about everything. My iron plants, my turbofuel factory, my coal generators, my main base with my item sorter. Everything.

I both want to rebuild everything to make it more efficient (as ADA would want) but at the same time, I don't want to start from the very beginning building wise. I've rebuilt individual factories (mostly iron, my god iron) but none of this was especially with trains in mind, which is SO much better. (I'm using it for Coal for the mega factory)

What do I do? Should I just rip it all up? I'm conflicted lol