Games make use of up to 6 threads, but single-threaded performance still determines overall framerate to a large extent. Games are not exempt from Amdahl's law: as long as you've got enough threads to offload work, it comes down to the single-threaded portion of the workload. The faster you can run the main game loop the faster the game runs.
Gamer's who prefer cutting edge performance should prefer multi-thread performance.
Optimizing for MT-heavy games is the gaming equivalent of premature optimization - everybody can run Doom at a million FPS, but Fallout 4 or PUBG shit all over every system and you'll be begging for every frame you can get.
You can "prefer" whatever you want but developers don't care. This site of all places knows that time-to-market is what really matters. If you want to play those titles, you have to deal with it. Either optimize for the shitty titles, accept that you're going to be losing a fairly significant amount of frames (the 2700X is behind as much as 30% in some titles), or don't play those titles.
I mean that if the software is implemented in the correct manner, "more can be done" by utilizing multiple threads.
But many games are still single-thread bound (despite being multithreaded). As such, Gamers should still prefer single-thread performance.