If you think the ergos on an Uzi are dated, go handle a Tommygun!
My favorite for sheer "wonkiness" is the Japanese version of the Hotchkiss.
Without looking them up, I can't keep the "type /model #" straight, but if there was ever a poster child for "why??????" that's got to be it.
Metal (brass I think) feed strips, 30rnds in a row, and IIRC, the gun put the empties back into the feed strip after firing.
Japanese LMG development was...chaotic is one of the nicer terms. Dunderheaded comes to mind, though...
Guns (and cartridges) were developed by the Army, the Navy, and for aircraft use, with little or no commonality or interservice sharing of ideas or tech.
Semi rimmed and rimless cases, oiled ammo, hopper feed using the 5rnd stripper clips from the Arisaka rifle, and other ideas that looked good to the designers but didn't do so well in the field.
And something I've only seen on a Japanese LMG, a bayonet! A cultural thing, I believe...