For all the reasons listed above in the thread.
But in summary IMHO:
- They are not really compatable with shorter winged SEP types for ground handling
- also they are mostly low wing/mid wing whereas many SEP are high wing and not easy to hangar together
- many SEP live outside year round due to hangarage constraints/costs whereas many TMG are not suited to that regime due to construction materials
- The TMG often operates a different circuit pattern that doesn't always fit with conventional SEP operations
- The type of flying TMG does is often different from SEP and can require a different mindset/skillset from SEP - sometimes different instructional skills can be required too..........
- Not sure if the market for TMG is big enough for schools to invest in something that that may not get the usage that the rest of the SEP fleet is getting...........or requires to make the cost model pay
Just my twopennyworth.........
Arc