There is a weekly cap you can gain with valor each week, if you dont make the cap one week you should be able to earn more the next week to balance it out to a certain point.
Its just a way to make low mythic plus items become useful so if you get one of the best items but only get it in a 2 at least you can upgrade it to 220 eventually.
Even if you only do hc content and the occasional mythic plus 215-220 ilvl is doable just by mostly heroic raiding considering you get get half you gear at 220 from hc almost.