BKING!
is Blowin Smoke!
I fill mine up, fairly regularly. I figure it doesn't take any more time or pellets to fill it up, as does to just cook a little. I really don't cook anything other than chicken over 275, and generally 225 - 250, so I might not be the best to ask. I dont think it is a big deal, other than if you are going on high heat, you will get some radiant heat from the diffuser, which will cause the bottom part of the meat on the bottom rack, to cook quicker.
This is true of most cookers. On my reverse flow offset the bottom of food would be slightly charred on the rack just above the reverse flow plate on higher temp cooks. Same thing for my kamado joe. About the only cooker that doesn’t have this problem are water smokers but they come with their issues as well.