Honestly the removal of flawed mods is completely unnecessary. It's not like they take a lot of endo to upgrade. At most there's what, a rank 5 rare? That's only 930 endo, and most of them are both lower rarity and lower rank, being much cheaper like only a couple 100 or so. Mods don't really start to cost a lot to rank for a new player until like rank 7 or 8 or so. Also some of the "flawed" mods are actually more effective at lower ranks, allowing you to fit something in a build when you otherwise wouldn't be able to because you didn't have enough mod capacity.