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The thought exercise wasn't well thought out. In the US service, the last time a company is equipped with all but a few soldiers using the same weapon was when the US declared war on Spain.

Since militaries transitioned to fire and maneuver warfare in WWI, weapons are used to conduct a specific task as a primary function. Automatic weapons provide suppression and the base of fire. Rifles for accurate engagements. Personal defense weapons for those engaged primarily in command and control.

If you choose one weapon to do all of those tasks, you end up with what happened when it was tried with the M14. It shot itself apart when used for sustained automatic fire, the leaders found it too heavy to carry and perform their jobs, and the infantrymen wanted their Garands back because the Garands held zero better.

There is a relationship between weapons, ammunition, and tactics. Don't expect to change one part of the equation without an impact on the other parts.

There is no such thing as the perfect weapon for all occasions.

Since this is in reality a M-1 Carbine fanboy thread start, it is a versatile weapon, but in a modern context only viable as a PDW.

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no windage adjustment is a set back

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If there's an entire infantry unit equipped with Lewis guns, they could probably fire for days and reload the mags and the enemy would never poke their heads up. They might run into an issue with the MG34-equipped unit suggested above. The Ma Deuce infantry would die of exhaustion before getting close to the MLR.