How is this a Mistake?

I like to learn from my mistakes I made this move trading my bishop for a knight which I understand that they say don't trade you bishops for a knight but like there worth the same and also this was my bad bishop since I had pawns on dark squares, now I know the position could open up and it could become a strong bishop but like I don't know even know what I am talking about, it doesn't even give a clear reason why its bad like someone make this make since like why was this so so terrible that they say it is a mistake. Now be3 has +1.51 and to that I say like what I don't understand like someone just make this mistake make since to a noob like me.

first off no one can even see the entrie position so how can we know for sure but second id guess the computer thinks youll push c3

Sorry here is the entire image it got cut off because it was to big, obviously. hmm c3 honestly didn't think of that.

i think its c3 maybe but i think e3 is just a the lesser of evils im not sure be3 compliments any tactics because i didnt see the whole position i didnt know but now that i can see it yeah i think be3 is just a safe square plus if you open up you lsb you dont have to lose any tempos protecting your pawn but i think you definitely want to open lines for your lsb

probably a4 after b5 and then c3

youre worse relative to the previous position because you woke up his bishop and you lost yours thats the other thing its a combination of those things.

Hung your bishop

I didn't hang my bishop, I traded it for a knight and it's saying it's a mistake with no clear reasoning on why.

Bxf6? cedes the bishop's pair.
Be3 preserves the bishop's pair.

It is again amazing how useless and bad Game review is.

"This is an unfortunate error" just sounds like some placeholder nonsense comment used in development, replaced by a real comment before the product is launched.

Would it be hard to program it so that "the Coach" says "Trading a bishop for a knight is not good in this position" or something like that?