Pretty much all Firearm based grenade launchers functioned like pseudo-mortars, but for the sake of the game it wouldn’t make much sense to make GL be Mortar class
That would mean having Mortar being an upgrade in pretty much every squad if we want to maintain the ability of having GL in every squad. The Mortar squad works fine as is with the standard Mortars being strategic weapons. It trivializes the Mortar if they’d only ever be used for GL
Yes it would make Mortar a little more interesting if they had a more offensive weapon choice, but still