Once you have teched as usf your mg costs no fuel. To not be able to see the inequality here just demonstrates your bias and ignorance.
Also your imagination of the strength of shreks goes far beyond the reality. Double bazookas are more than a match and on a much more durable squad with faster healing. The point is, you can't wine on about a specific deficit in your favorite faction without looking at the whole. To complain about shrek blobs is to ignore the glaring facts about how the factions are inferior and superior in various other ways.
But my dear fellow, why would you shoot yourself in the foot by teching LT? When the captain is just 10 fuel more and has dual bazookas, speeds up production and has better units in his tier.
The only time I ever get LT is if I want to backtech for the m20 AT mine.