Small annoying change of mob evade mechanics

Hi all.Let's talk about the new mobs' evade mechanics.Take a look at the picture - it is important to understand what I am talking about. (Paint madskillz yea)Thus, before 28/11 patch there were no such a red line - crossing which the mob could become invulnerable.You could run away or just kill it or kill it while kiting if it's a champion.KITING, do you know that word?So here are two questions: is this intended and if so, what are the reasons for changing five-year game mechanics?

In theory you can kite 1000 mobs to the same Place. Forcing respawns of said mobs in previos plays. Mob population would explode and server dies.

Therefore u you cant kite straight into one direction. really gotta look at old maps, feels Really Naturally to me.

For example ; if a champion spawns at east of the map, i could kite it to the north and other people wouldnt find it etc.Many reasons.