Being a full-time enjoyer of DeepSeek-R1-0528-Q2_K_L, why should I consider DeepSeek-V3-0324?

What's the point of overriding the system prompt in DeepSeek LOCALLY?
Just wondering which hidden (for me) possibilities are there

Is it about switching off thinking, or jailbreaking per default or what?

Please bear with me since I'm too late to this show