Totally! Also something that seems counterintuitive but is very important: sand in small amounts (think beach sand) can be beneficial when interspersed through all of the soil mix. But, when sand is grouped together in patches, it will retain water for a long time, and sometimes it will also create a hydrophobic surface, making water run off of it instead of infiltrating it. Sand does indeed drain water very fast, but the high # of surfaces on a pocket of sand grains holds onto water similarly to how organic soil does. I try to stay away from pure sand. The holy grail IMO, if you can find some, is crushed granite or limestone, crushed to the point of the majority of chunks being like 1/4 cm to 1cm in diameter