>>717756475 (OP)
The point wasn't that you shouldn't utilize either side of the force and be completely grey. Kreia had 2 major points:
>she wanted you to make choices for yourself, not to just follow dogmas or make arbitrary decisions based on your side or predisposition
This is why every time you do something, she scolds you. She's not actually flaming you for your decision, she just wants you to explain why you did it so she can make you practice mindful decision making and so you show that you aren't just doing it "cuz someone/something told me to."
>she wanted to literally kill the force
Kreia believed that the force was a crutch and/or a handicap that prevented those of strong will from truly achieving their potential, and that by using the force to achieve your goals, you are inherently weakening yourself. Yes, she used the force because she also practiced and "ends justify the means" mentality. Also, if you want to go deep on this, she also probably wanted to just exterminate all life itself since destroying the force would literally kill every living thing.
>>717762146
She wanted you to think for yourself, but she also wanted you to choose to be by her side so she could use you to kill the force. Her praising you was only because you showed that you were stronger, and she remained true to her belief that the stronger should ultimately win out.
>>717762509
Jedi Guardian with Double-Sided Saber (not dual blade) is objectively the strongest lightsaber build in the game. I forget the exact crystals, but just take stuff that ups your attacks and your chance to land attacks. Master Force Speed + Master Flurry with Double-Sided Saber will one shot even the tankiest enemies on hard mode.