Hot Take: The Arsenal Should Be Rank Locked
I know people are excited for items inside the the arsenal to be rank locked, however I don't think it will solve the problem of players draining supplies at the start of the round. The experimental servers have shown that things like 40mm grenades, RPGs, and medical items like morphine and saline bags will still be available for everyone at the start. The rank locked items will not stop players from draining supplies.
I propose that the arsenal itself should be rank locked, specifically at Sergeant. This will force players at the start of the round to go capture a couple major/minor points, deliver supplies, and/or transport troops, etc. Usually when one major point has been captured, at least one player has reached the rank of Sergeant. There's plenty of supplies for loadouts, and the living quarters can be built to halve the cost of loadouts being spawned.
These are just my thoughts and opinions. I'd like to hear yours as well.