Personally I think as a bowler/fielder you only really notice a chance for this if someone is backing up 'too' aggressively, if thats the case I'd have no issuse mankading them (in a competative game anyway). As a bowler I'd be worried if I was noticving a batsman backed up a few cam too far as I hit my delivery stride.
I think th4e game always evolves over time, and this is no seen different as compared to 15-20 years ago. Much like sweeping etc, when I was a kid in the 90's there were still plenty of umpires that would trigger you any chance they got if you played those sort of shots that they didn't consider 'cricket', now you see then on a daily basis.
I have previously given multiple 'warnings' without ever actually mankading someone but I think having through about and discussed it that i would now, espoecially as we play a lot more shorter format games where run 'stealing' can be game changing.