I should add that I also agree 100% with your callout on Legendary weapon upgrading. In fact, it almost seems Bungie didn't want to allow launch-era Legis to be upgraded simply because they so visibly upstage TDB-era Legis in all but max ATK stat. Look at the A.1F19X-RYL in comparison to almost any of the new Scout Rifles, f.e. It's evident which is the superior base stat template. And it's not close. Counterpoint: B-Line Trauma appears to actually be superior in field use, but its fire rate (the one I saw, anyway - I don't own one) was insanely high. It may in fact be glitched. Certainly it's much higher than the stat template suggests, it was almost up there with the higher-Impact/lower-RoF MGs.