Not taking a stance on the morale of tripping, regardless of my personal opinion of it (forgive me, a former drug enforcement officer), but there’s something that needs to be pointed out with regards to game mechanics and realism.
Morale is directly linked to Focus, the in-game ability to learn anything new.
In real life, drugs may assist the brain in utilizing already open neural pathways (thus making doing things you already know easier), but (with certain notable exceptions) they actually inhibit or outright prevent the brain from opening new ones, meaning that you have a hard time learning much of anything while under the influence.
Music, on the other hand, is proven to assist the brain in this process more than ‘just a little’, in fact sometimes showing as much as 60% gains in retention, or so I’ve heard.
So, while it may not make sense when given the meaning of the word morale, it makes sense from a mechanics standpoint.
Therefore, to successfully make the argument of ‘realism’, you’d have to disconnect morale and focus, and that’s on top of re-balancing every single item that influences morale.
I don’t think it’s worth it, personally.
(But I agree that solid stat boosts from drugs are silly)