DRAGON+ has lots of purposes, including teaching that "diversity is strength." It's not always about 5E crunch, but also about building goodwill toward the D&D brand as a whole.
DRAGON+ Issue #37 features amendatory statements on the drow:
"Everyone—aboveground and below—knows that all drow elves live in the Underdark and worship the Spider Queen.
"And everyone… is wrong.
[...]
"While these actions drove a wedge into the family tree of elvenkind, the drow that built Menzoberranzan are but a splinter group. The Forgotten Realms is about to learn a truth that has remained secret since Lolth’s initial betrayal.
“The spider-inspired ‘udadrow’ expression of the drow elves that D&D fans currently know is based on Lolth’s influence over a pocket of elves who became isolationist, cutting themselves off from the rest of drow culture,” explains Franchise Creative Director Jeremy Jarvis. “There are whole societies of drow that did not follow Lolth into the Underdark. Two such groups are the ‘aevendrow’ and the ‘lorendrow’, or the starlight elves and the greenshadow elves respectively.”
[...]
"As part of this worldbuilding we had to show that Drizzt was hardly unique as an udadrow who isn’t evil."
***
The article also features an interview with R.A. Salvatore where he touches on the amendatory new direction he's going with the drow.
As far as I can tell, the recent erratum to the Players Handbook suggests, the drow didnt "follow Lolth into the Underdark".
Rather, the elf variants adapted magically to their respective environments, whence the drow elf variant adapted to their Underdark environment. Thus all drow are part of the Underdark and as such can magically create darkness and light. Lolth only corrupted some of these original drow.
"
As a drow, you are infused with the magic of the Underdark, an underground realm of wonders and horrors rarely seen on the surface above. You are at home in shadows and, thanks to your innate magic, learn to conjure forth both light and darkness.
Your kin tend to have stark white hair and grayish skin of many hues.
The cult of the god Lolth, Queen of Spiders, has corrupted some of the oldest drow cities, especially in the worlds of Oerth and Toril. Eberron, Krynn, and other realms have escaped the cult’s influence − for now.
Wherever the cult lurks, drow heroes stand on the front lines in the war against it, seeking to sunder Lolth’s web.
"
I like this nuance better. The drow are naturally gray-skinned and are native to the Underdark. Evil Lolth is superfluous.