I don't think this is a fair representation. Glider commandos are a much closer approximation to the type of callin that FSJ are, and the cost of racks has to be divided into the number of squads it's used for so if you get 4 commandos the utility of that 15 fuel investment has to be split 4 ways. You dont tech racks for just one squad, so you cant really use the full tech cost to represent one squad.
glider commandos are even more expensive because you are forced to buy an officer and retreat point before you can even purchase one squad.
Infiltration commandos come in the strongest and most picked commando doctrine so it's completely relevant, why do you think players like Jove will insta lock mobile assault commander and use a single squad yet never fork out for brens or extra squads? Because it's redicoulsly expensive compared to falls.
Upgrading brens on commomandos is just dumb, you pay a premium but you get out traded anyway by vet obers and falls as the game drags on. I don't know why people are bringing them up as proof of anything because they are way more expensive and still inferior lacking snare from camo.
And yes been racks need to be accounted for, because it's not exactly easy to afford when Tommies have just been hit with the nerfbat and 5man upgrade is basically mandatory now.