Just had a pollo pipian burrito that had no vegies in it, just rice, beans, mediocre stewed chicken and an admittedly tasty swath of pipian sauce on top, although no discernible salsa inside. So, I asked and was what appeared to me to be grudgingly given one of those tiny plastic 1/4 shot cup thing worth of chopped tomato and onion salsa. After pouring in (under protest) the side salsa given with our side order of chips, I was still left wanting, so as I neared the end of my burrito I asked and was given one more tiny bit of what tasted like a spicy BBQ sauce.
To me, a burrito is in large part a storage vessel for salsa: It is to be slit down the middle operation style and salsa (sometimes different kinds at different sides) poured in. Loteria's stingy salsa policy defeats that purpose (and their lack of even onions or cilantro, just rice and beans) in that burrito is disappointing to say the least.
Don Felix is also stingy on their salsa, but their lengua burrito is delicious so its worth braving the 4 trips to the window to grovel for more (not worth it at Loteria)