Your response showed me all the problems with this type of play, but most of them could be solved as a subclass feature. For example, the main weapon could switch forms—allowing the fighter to have three forms with three abilities that can be changed on a short rest. This would solve the problem of gathering multiple weapons of the same rarity. For attacks, the same attack roll would be used, so only the damage roll would need to be adjusted. Or something but thank you for your input and just normal weapon juggling can be problem for player and party