I've read that they build equipment at all quality levels, depending on spec. Not saying the Cub Cadet is all that much.
However - the EFI works great, and that was my point.
I'm here to tell you that I delivered hot rolled steel sheet and strip to MTD facilities in Cleveland, Ohio, Mansfield, Ohio and south of Toledo, Oho, for years and they never bought anything but the cheapest grade of secondary rejects available.
The facility in Mansfield (formerly Shiloh Industries) does most of the stamping while the facility south of Toledo does the assembly as well as the Cleveland facility which is also corporate headquarters. I'm real familiar with them. having said that I own a CC zero turn but an M60 tank which is the commercial version, a CC rear time tiller (RT series). Both are good but both share good and not so good components.
The frame on your CC tractor is HR secondary reject. Can tell you that. Expect the paint to flake off as well because their prep to paint is crude.
Like anything else, you get what you paid for and you are lucky in the fact that the local shop gave you good service. Usually a box store purchase and failure and getting the local shop to warrant it (because no box store warrants anything) usually is a crapshoot. Why I deal with the mom and pop places rather than a box store.
Lowes sells a pile of John Deere wannabe lawn tractors (built by MTD btw) and then pawns the warranty service off on a mom and pop shop. You could have paid the same fare at the local shop as the box store and had immediate peace of mind that the local shop would have handled any issue, which they did in your case, but sometimes it don't play that way.