While I don't disagree with the rulebook sections backing the use of TLoS that you quote, and it may have been JJ's intention to use TLoS in the game, let's remind ourselves that while the rules are great, they ain't perfect, and JJ is just a bloke, capable of mistakes or flawed reasoning, same as any of us!

I think the reasons to use LoS-blocking area terrain are pretty good:
1. different model scales, proxies or basing your titans on resin bases to add an extra bit of height make TLoS inconsistent and may give advantages/disadvantages to one player
2. JJ has specifically stated that the game has an elastic ground scale which makes things kinda weird anyway
3. Epic as a game is pretty abstract already, with most granular elements removed, it kinda seems weird to preserve this particular fiddly mehcanic
4. Fixed terrain, while lovely (yours particularly so Onyx

) tends to be more impractical and can get in the way during a game, we've all had those engagements where we can't tell if a crucial unit or three is within countercharge distance, with EpicUK style 'scatter' terrain, you can just remove the trees or buildings and get right in there to check.... I probably move the trees and buildings around 2-3 times a turn when playing an average game, helps remove ambiguity
5. Terrain scale, as has been said previously, the terrain scale of the game is pretty bad, even the mighty warlord titan is only of the order of ~30 metres/100 feet tall, many trees reach this height quite regularly and many are significantly higher, I'm currently sat in a building with 4 stories which is over 25 metres tall.... in all practicality, titans just aint that big (and they're the biggest things in the game)
I really like how battlefields with modelled terrain looks and have maximum respect for your efforts in creating it Onyx and Co. I just tend to think that in a game of abstraction, that terrain is best abstracted and is more representative of the
type of terrain in the area (whether it be ruins, buildings, or woods) rather than specific buildings
also I don't think this needs to be standardised at all for the NetEA process, perhaps a few thoughts tacked on to a batrep as to how the list might have performed differently with area terrain/TLoS would be the best option?