The process of designing FTC games is involved. The level of challenge, technical content, tie to real world engineering, ability for veteran and rookie teams to succeed... it's a long list.
In addition to that the "practical" considerations of availability of materials, tools required, and cost all factor in.
Near the top of this practical list is the Minivan Requirement. Specifically, the game has to fit inside a minivan to make it feasible to transport by Affiliate Partners and teams.
This photo shows Get Over It! packed up on the standard gray cart. It was going to be one of the hints but we couldn't make it too easy.
So - At a minimum teams can build field elements, if not the whole field. The dispenser is probably the most critical piece to practice. If you're feeling ambitious build a whole field and hold a scrimmage in your area.