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Generally that is very true. However, with the X100-series it's a bit different. The adapter ring fits onto the lens by removing the front ring of the lens and replacing it with the adapter ring. This is a bayonet lock. The adapter ring then holds the filter and lens hood (through a bayonet). There are also lens hoods that screw-in. These can't be connected to the adapter ring but have to be on top of the filter instead. That's inconvenient because when you loosen them, you often also unscrew the filter.

The off-camera cable is like an extension cord. In this case it has four terminals, whether used on a Canon or on a Fuji camera. The important point is Canon and Fuji use each line for a different purpose. A Fuji flash mounted on a Fuji camera works fine. A Fuji flash attached to an extension cable that has four lines that meet the terminals? That'll work fine on a Fuji camera. I have a Canon extension cord that's more than ten years old. It used to connect my Canon A2 to a 540EZ flash. Now I attach my X-H1 to the cord to a Fuji EF-42 and it works exactly as I would want. Don't hesitate to buy the Canon or the Vello-for-Canon cords. If you deal with one of the big New York stores where you can actually talk to an informed sales rep you can get the right fancy or budget cable.

X-T2, 90mm

I have an XT-3 / X-H1 and the X-H1 camera is my favorite. It is a professional camera and requires a steep learning curve. The construction is very resistant (professional workhorse) and for amateur is this camera for very, very long term use. I´m very happy with the X-H1, mainly the IBIS function is extremely great. (I switch from Canon FF to Fuji 4 years ago).

Third party options of adapter ring that screw onto the lens combined with a good UV- or protection filter work just as good. I believe JJC has a good one. Make sure the optional lens hood works with a bayonet. That's easier than a filter thread screw-in one.