Actually, before they gave the option to remove upgrades, The sniper would get a bayonet, and let me tell you.... that was something you hated. Please tell me you can at least see the downside of the sniper with a bayonet.
I can see the
concept. At 100 meters, though, I doubt I could see the
bayonet, which is a bit more important. It's not that the bayonet
can't give away your position, it's that the difference it makes is so small that it hardly makes a difference. Plenty of people have complained that it gave them away and resulted in them being killed, but that's confirmation bias of the worst sort (They don't know how the enemy actually saw them, so they assume it was because of their bayonet).
My comment you quoted about how rarely I've seen people because of their bayonet is including those snipers you mention. It's not generally been an issue. In fact, most of the times I've seen someone because of their bayonet, it's because they're less than 50 meters away (And a large number of them under 10!), and at just that perfect distance where their bayonet pokes out the window but their barrel doesn't. And just as a preemptive note, this is still far, far less than the people who actually had the muzzle stuck out the window.
The other issue is "realism". That is to say that the gun was balanced without the bayonet. Then if you put it on, it was front-heavy and a little harder to hold still. Now, this "realism" wasn't put into Ro2, but most of us REALLY liked the idea. This was because Defenders, who were shooting, did NOT have bayonets attached so they had better aim. Attackers, who were charging in, planned for close combat and had the advantage of preparing their bayonet. Now, a defender could worry, and put a bayonet on, but then they sacrificed their aim on killing soldiers before they reached close combat.
The Mosin Nagant was actually zeroed
with the bayonet attached, as the soldiers were expected to always fight with it attached. Detaching the bayonet would actually
decrease accuracy, giving even less reason to do so.
Not that any of that is in the game.
Although I will agree with you on one thing; having a separate melee weapon doesn't make much sense. You can't get more powerful than a bayonet, and it doesn't take much to make the butt-strikes do max damage, so I'm not really seeing any use for it...