I agree with the sibling comment, that "10x"ness is only weakly related to tool usage. I've done some of my best work in ludicrously awful environments because that was the only feasible as a result of a whole stack of previous tech choices made by other people, usually for valid-looking business reasons.

VS2005 inside an XP VM? To build WinCE 4? In 2015? No sane person would choose that environment today, but it had been a valid choice in the mid-2000s and the hardware was still working, so I rolled up my sleeves and fixed the bugs. Customer was satisfied and we all got paid.

The only person I've ever worked with who could concievably be a 100x engineer did some of his best work on paper. But then he was a heavy-caliber mathematician.