I used the old destinylfg.com for years...
It was clean, clear, simple and very quick to use. Didn't require sign ups. Exactly what I and everyone else wanted. It was what won me around compared to all the other solutions out there.
This new place is a disaster. Dark, ugly, hard to read, hard to use (especially on my iPad where scrolling through the filters takes an age).
I can no longer set a filter in seconds, and write my listing in another few seconds...
On top of all this, listings seem to last for hours, which due to them being hard to read, isn't even obvious, I started to message someone who had listed 4 HOURS ago... what's the point of that?
As for the forced sign-in... Was fraud and spam really that much of a problem. Didn't see it myself in all the years of use. Just sounds like an excuse to get people to sign up, get their details and data for possible monetisation.
Talk on PS4 chat is the same... BAD MOVE.