What dumbazz guide would go out with a dirty rifle? If any weapon in the field gets dunked, dropped in mud, or falls over in the dirt - it would take a full-blown retard to blow it off and let it go. Because that's your butt on the line.
In the early days of the M16, they suffered two misfires per thousand shots, due to:
1. The rifle and round was tested with Dupont IMR 8208M stick powder, but the Army had a lot of Olin WC846 BALL powder they substituted, and it fouled terribly unless the weapon was cleaned well and often.
2. No cleaning kits were issued, nor were any cleaning instructions given.
3. The barrel was not chrome plated - leading to corrosion and trouble extracting the rounds.
4. Rifles didn't have a forward assist - which slams the round to seat like a bolt action does.
Semi-autos are very reliable - even automatic pistols - and if you know the weapon, and you know the trick, each can be cleared of a stovepipe or double feed in one second. Even a Winchester Model 12 pump shotgun I used in combat would occasionally have a round jump out of the magazine and jam the loading gate - which I had slotted, enabling clearing in an instant with one of my dog tags.
No weapon is 100%. Not one. The semi rifles are now as accurate as bolt actions, a whole lot more accurate than a lever, and you can put three rounds on target for every one of the bolt actions or lever actions. Lots more firepower without sacrificing accuracy.
I agree on everything else you said. I just saw a video of a guy poking a small cave, pistol in hand, and he didn't get a shot off - a cat came out and got on him so fast he couldn't do anything.