After the 2008 crash most manufacturers, across products, began using much cheaper and inferior materials. This isn't a metal vs plastic issue but a quality metal/plastic vs weaker/cheaper materials issue. You can see it in cars especially with engine, transmission and trim. Lower heat tolerances and easier to break. 2008 was the start of budget cuts and spike in mineral prices. In a nutshell, the stuff we use to make metals and plastics got more expensive to find, extract and manufacture. So it's not Nikon d700 vs Fuji issue, had the X-T1 been built in 2007 (with current tech) it would be a much sturdier camera than what we have now. The d750 I have now is not as robust as the d750 from 8 years ago.
Fuji does not sell parts but I've been able to find spare parts for a fuji x30 and that means it probably got outsourced to a manufacturer in China - since it's the company in China selling the parts and only for that model. I see a stock market crunch coming so I wouldn't be surprised to see a lack of inventory on new camera models. I'm looking forward to the xpro2, nikon d500 and sony a6300 but we'll see how it goes. Just in time inventory is a real pain when 'events' happen.
Anyways, fixing the sd slot shouldn't require a fuji specific part since that's a 3rd party item made to fit sd cards inside many cameras. I'll just have to make sure I get one with the same wiring and data speed capabilities. Or just replace the ripped wire inside the slot. We'll see, it's more of a personal challenge now than anything cost effective.