Why do people have an issue with boosting?

[Tpbucs-sargeras]

@Lilithia-nagrand

I see nothing wrong with it, if I had the money, I’d boost all my characters to max level and get them ready for raids to save time.

They seem to get a lot of hate though why is this?

uh oh, Mikey. The arena forums are bout to 'SPLODE!!!