I got spigots on both my fermenters when I ordered them. The spigots on those sit a hair higher than where I set the level on my bottling bucket when I made it. I don't think many pre-made bottling buckets have the spigot as low as mine.
Anyway,The trub normally compacts well below the level of the spigot. Especially since I strain all going into the FV to start with. Even if I don't,I only get about 3/8" of trub & yeast at the bottom at that point. And the spigot sits well above that. I get maybe a dusting at the bottom of my bottling bucket of the grainier particles. And that's with tilting the fermenters a bit to get nearly all the beer out,save for maybe half a bottle.
So don't worry about trub in or up to the level of the spigot all the time. That just isn't so if you take some quick steps to avoid it. A little bit more work now means more clear beer later. The choice is obvious.