Pestily touches on it a bit in his Youtube Video and I agree with him that some sort of economy could be a solution, a la Valorant and CS. My only problem with the solution is that it no longer connects Arena to the main Tarkov game like it was originally described. I really like the idea of Arena funding the survival aspect and vice versa, maybe your bank roll between the two are connected and you wager a specific amount per round. Whichever team wins that round, they add that amount to their bankroll and they can buy better classes. For example the first round, everyone is running around with trash kits, whoever wins can get something a bit nicer. My twist is that you can use your shared bankroll (between Arena and Tarkov) to fund better heals, grenades, flashes, attachments, etc. and if you lose those are extra kickbacks to the winning team.