I like scavenging, but I would prefer if it's for things that don't break reality too much. Let's go through the tiers of immersion breaking that JA3 goes through.
1. Stop complaining tier: Enemies don't drop their equipment. This is a standard videogame mechanic and should be expected. Obviously done for balance and to encourage scrounging. This is fine, it's a JA standard.
2. Okay that's pretty bad tier: Some ragtag bunch of assholes who can't even afford clothes or clean drinking water is vastly better equipped than you.
3. My immurshun is broken tier: When mercs (who canonically have done at least some jobs before) show up to the gig in a t-shirt, flip-flops, and a double-barrel shotgun. The gun nut in me is double-overed in cringe laughter. Brodudes, the Remington Model 870 has existed since 1950 and is like 500 bucks.
4. Infinite jest tier: So you capture a fourth-world village and need to arm the people against their oppressors. Okay, you throw them a few Browning Hi-powers (kek) right? Nope, they're fully armed with FAMAS and whatever the fuck bullpup that you magically pull out off your ass. I was very tempted to shoot them to see if they dropped the things.
Jagged Alliance is satire but this is too much satire.
On 2, I wouldn't say they are vastly better equipped, at least not in the beginning. Most of them have bolt action rifles and SMGs, which you get plenty of soon enough.
On 3, this is one of the aspects I like. These are just some crazy dudes and gals (merc tourists) who signed up for AIM, and if you want the real military dudes you got to pay for it. Maybe the weapon smuggling just cost too much for anything heavier. Live off the land type of deal. I remember watching a documentary about south african mercenaries somewhere in Africa, and just getting a small speed boat was a major pain in the ass. I think they had one AK which they shared within the group. Most of the time they just bluffed their way through stuff, but eventually they got government support and got more equipment.
On 4. I agree with this, but it has been like that since the first JA. Not sure how to balance it. But there is a cost for setting up militia, so I assume weapons are included, but then the fact remains why we can't order from that source. Don't know how to balance it.