I have to say that I don't agree.
In my opinion there are times during a season where a manager has got it selection or tactically wrong from the first whistle, the game doesn't pan out the way you anticipated or you have some bad luck and get punished.
In addition it might be that the set up and style have been negated by the opposition tactics or one or two players are having a stinker of a game, and when some of this is the case and a game is going to end in getting nothing from it what is the harm in having something different on the bench?
Nothing ventured nothing gained?
Maybe it won't end up working out but at least you've challenged the opposition and given them something else to think about, something outside of the realms of the preparation that they have done, and yes at times something simpler and a bit more 'industrial.'
Plenty of managers have done it with great success down the years for example look at Alex Ferguson's record with Ole Gunnar Solskjaer from the bench. If my memory serves me right it won them the European cup.
And yes I absolutely agree that the lack of urgency and insistence in fidgeting the ball around the back four when we are losing with only a few minutes left is absolutely infuriating and I'm baffled as to why Rodgers is not up on his feet and screaming at them to get it forward.