Why do you like or dislike love triangles in BL (or other genres)?

I don't want to attack anyone's preferences, I'm just genuinely curious about your reasons. I personally dislike love triangles and here are my reasons:
- I don't get why put three people together in a 'love' relationship if they won't be poly in the end and one person is going to be cast aside. In that way it's always hurtful and someone gets 'bad end' while the other two are happy together. Real life is also no bed of roses, but it's quite depressing to read.
- For me it's a bit unbelievable that MC gets stuck between two guys and can't decide for 100 or more chapters (months or years in fictional world) which one he truly loves. If he doesn't feel strong enough about any of them, maybe he's still waiting for a third one to show up? I have no idea if it happenes in real life. Is it so unrealistic for me just because I didn't have such experiences myself?
- It's a really unequal dynamic and I think it's difficult to make a character in the centre of a love triangle not too annoying. Leading two people around, giving them false hope... It screams selfishness, flippancy and irresponsibility. I can't understand how someone could be so frivolous when it comes to other people's feelings, even if they're just fictional feelings.
That would be all. Please share with me your opinions. Maybe you can change my mind about this matter (I honestly hope so, because there are so many stories with love triangles nowadays that I find myself with nothing to read).