Sure but by segmenting that we can make the T2 units available earlier while locking the LMG and Rifle Grenades at a point where they should come, instead of balancing the tier for the T1-based upgrades and delaying units that would be balanced either way far too much.
I see so how about something like building T1 unlocks T2 and BP1 unlocks the Rifle nade, LMG, and BP2 this way you get T2 faster and keep the BP design.
Im just trying to come up with ways that don't involve major faction redesigns because I don't think relic will commit to big changes with the Tier system of any faction, some cost adjustments would be necessary to keep T2 from coming out to soon.
The way I see it BP1 exists to give you LMG and Rifle nades, removing these upgrades from BP would make BP cheaper and that would mean medium armor would hit the field way earlier than it should