I'll say that again: More demanding tactics will have impact in your performance and chances to win, BUT in exchange of your players consuming more condition. Like in real life, if you have your whole team doing high pressure on their rivals, yes, that gives you better performance ... for a while, because it makes your players lose a lot of energy very quickly, so you can't (or shouldn't) be doing that all the time in all the matches. Just when you need it.

In real life though you do not have magical treatment packs to restore health instantly.So if you want to copy real life shouldn't you prevent their use.