I honestly don't agree with this mindset at all, and I feel like practicing this way will severely hamper your ability to beat the best players in tournaments. I think it's self-explanatory that tailoring your playstyle to ladder opponents is not optimal unless you only care for your ladder rank, but playing extra safe and not cutting corners strikes me as lazy. IMO, it's important to continuosly push the envelope and develop yourself as a player, and with such a huge emphasis on safety and on your ladder opponents you're restricting yourself to a very narrow range of builds and disregarding some incredibly important aspects of the game.
Echoing what Sparrow is saying, there is a difference between grinding the ladder and getting tournement ready. A lot of players are looking to improve their mmr to get a better level of practise from the ladder, so you grind up like this then develop your depth once you are against better opponents.
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