With buffers gone, it's a little less important. When buffers were there, I thought it was vital to have the buffers for your two xp types in your prompt, so that you were always aware of when you were about to fill them and when you were about to empty them.

These days, I don't use prompts nearly so much. If I'm playing a long-term guild, I'll put the long-term time into my prompt. If I'm playing a spell-casting guild, I'll put the current spell being casted in my prompt. Beyond that, all I see as essential are hp/HP, mp/MP and fp/FP.

Thus, I don't think this is a critical change, but it might be a little useful. I don't think prompt-setting really separates players in terms of effectiveness, though. It's just for a little bit more convenience.