2- one of the actions that the investigators can do is (Engage) action. What is the purpose of such an action? I mean that if I wants to attack an enemy it is enough to take a (Fight) action while I'm in his location even if that enemy is not engaged with me (i.e: maybe it was exhausted somehow previously before I move to its location). So why should anyone use this Engage action? Specially in Solo mode play?
Thanks a lot
Clearly engaging is something that is mainly used for when you have a team of investigators. So you may find it has almost zero use in the default campaign when you play solo, but that doesn't mean it is pointless... on the account that this isn't a strictly solo player game.
A guardian may want to engage an enemy to take it off from a seeker, so they can do what they do best. Not to mention they may gain some bonuses or triggering some abilities in doing so.
A rogue may want to use his high dexterity to exhaust a particularly nasty enemy through the evade action. For instance a certain enemy that retaliates whenever you fail an attack against it, so that the whole group can then attack it without worry.
But you cannot evade an enemy that isn't engaged with you. So you need to engage it first.
But yeah, if you are solo, you pretty much only need it for aloof monsters, which do not exist in the default campaign.