I don't think you have asked the question very well, but I think this kind of thread is actually quite healthy. Obviously more planning/city micro is always better than very little or none. But I think the real question you are trying to ask is:
Could I have played this game with a different playstyle other than just Monumentality/Golden Age/ICS...and still been competitive with this playthrough?
I am also interested to know the answer to this question, because having different ways to play, imo is core to this game being interesting. That essentially is 'Grand Strategy' and I think it might be something that is missing in civ6 (something I have talked about in more depth in other threads)
Recently I have been playing through the same game multiple times, to try and find if different playstyles can be comparable/competitive with each other. So I will try and play through this game with a different gameplan and I will report back (I think it would be great if others do the same too).
Usually I play on Online Speed, and I think the first 100 turns of a Standard speed game probably isn't a large enough sample of time to answer the 'Does Grand Strategy Exist in Civ6?' question, which if I am reading you correctly, might make a better thread title?? Or perhaps I am talking out of my rear end...