Downsides: Prepare for a bit of a rise in grocery cost. Prepared foods cost less than whole foods. This is American governmental ag subsidies in a nutshell. It's unfortunate and unfair, but true. Also, as others have mentioned, you will be in the kitchen more. Again, it helps if one of you cooks and the other cleans up. It's a little annoying to be sure, but the results are more than worth the annoyances. It is also very difficult to eat out. You pretty much are limited to places that are expensive and accommodating, delis where you know and trust the ingredients, or Chipotle. Again, the slight isolation (if you can do this or at least begin it when you have a little time to spare and don't have a lot of socializing) helped.
This 2003 CrossFit Journal article captures an early conception of a universal, multi-event test of fitness that laid the foundation for CrossFit competition, including what would become the CrossFit Open and the CrossFit Games. The design requirements for such a test "included but were not limited to the following: quantifiable results; consistency with the CrossFit fitness concept; raising our commitment to improving absolute strength, relative strength, and gymnastic foundations; balancing intrinsic abilities of smaller and larger athletes; emphasizing exercises critical to and foundational to advanced training; mixing training demands within each test and, of course, over the total competition; a design that would identify an athlete’s weaknesses and possibly stand as a workout plan for improving overall fitness; and, finally, we wanted to design a competition that would be 'hard as hell.'"