I'd agree that the rogue shouldn't be scared to enter melee, as long as they have a buddy, but I don't think they should necessarily stay there or that it's a bad call.
The OP puts forth a multi-class fighter/rogue, so I feel comfortable saying one of the most dangerous rogues I've ever Dm'd for was an Assassin Rogue/Hunter Ranger. PHB Ranger, to clarify. Longbow, plus Colossus Slayer, Hunter's Mark, Sneak Attack, and if he got high enough level a second attack. Very, very powerful.
Also, it tends to be easier to get surprise attacks with a ranged weapon than with a melee weapon. Snipers are incredibly deadly and in a large forest, the Ranged Rogue can be ridiculous.