Why does the client have priority over task manager?

Honestly, who thought it was a good idea to do this? Sometimes my game freezes completely and I can't open my task manager to force-close it. What can I do??? Can I make my task manager have priority over the client? If yes, how? Edit: I have to restart my entire PC when it happens and most of the times, I get low-priority queue. That's why it's a big problem for me.
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