It's not necessarily the TMT that makes your game load slower. If you have dozens of TMT object, especially those that are done with no grasp of the importance of LODing, those eat away on performance, that's not down to the TMT.
However.. those example scenes.. i don't think anyone will find them helpful by now.
What i personally would rather see is a COMPREHENSIVE and EXPLICIT guide on the workflow steps that TMT requires. The guide is like one of those useless books that scratch on the surface of a topic but never give a true insight. And in a lot of places the info given isn't even accurate.
I've just tested (upload failed with a timeout notice) an asset that closely scratches on the max. spec. but apparently that LOD "guidance" is useless. I can now waste another day trying to fix something that SHOULD work fine according to the guidelines.
Here'S an example "LOD 5 - 10%-0%" that would be a margin between 800 and 0 tris. This is misleading, why not put an explicit max. tri-budget there? I doubt 800 tris for the farthest LOD is anywhere near useful. However, the model i'm working on does need a few tris even in the lowest LOD, but i currently don't even know whether the uipload fails due to one of the LODs being over-target OR if it's some other hickup.
Also, it would be GREAT if someone from Frontier could go out of their way to explain to the average PlanCo user how a 3D model with textures just ain't the same as a Blueprint (and therefore naturally has a bigger filesize) because i'm getting tired of being rendered stupid by people who don't even get the difference between the two. Instead it was stated how filesizes should be kept small without further specifying on the matter.
The TMT is great in its conception, but you are currently doing EVERYTHING to make it impossible to feel ok with the way things are being handled. Us modders we get all the blame and the beating and the ones who should come forward to clear up some confusion and to make it a little easier on us, they just shy away, waiting out the storm in their hidden shelter.
Who wouldn't be mad if they had to completely change over and adjust their workflow while working blindfolded basically. And what adds insult to injury, the TMT was much more stable and reliable when it was released, now it's become a coding-mess with any new upload attempt being a game of Roullette.