The list of "background features" in the Character Origins UA doesn't include a 2014 style background feature, nor do the sample backgrounds. Instead, there's a 1st-level feat on the order of the Lucky feat. Of course, the Haunted One background doesn’t appear in the playtest to use as an example, but take the Sailor background. The 2014 Sailor has the background feature Ship’s Passage which allows the Sailor to call in a favor with former crewmates to obtain free passage on a sailing ship for the party in exchange for their assistance of the crew during the voyage. It’s a limited but tangible benefit which connects the Sailor to the world through crewmates with which they’ve formerly served. The UA, on the other hand, gives no indication the Sailor can obtain any such benefit. The fluff-text is limited to backstory prompts that could possibly be leveraged to recall information about undersea lore or posit various connections with ship’s crews or the inhabitants of ports of call, so basically what you’d already expect from the 2014 Sailor’s backstory, and there’s literally no benefit specified upon which the player can rely. The UA sample Sailor also gets the Tavern Brawler feat, giving benefits to using unarmed strikes and allowing using furniture as clubs, so some minor combat-related benefits instead of a player-facing ability to posit and draw upon connections with former crewmates.
I don’t use the recent books you mention. What’s being compared here is the 2014 core books and 2024 editions of those books as revealed through the UA playtest.
But whether or not the background features were ever useful or not has always been up to the DM and depends on details of the campaign being played and the current situation. A DM could potentially make them available and useful but they don't have to. For example, I'm playing a Curse of Strahd campaign, my Sage feature being able to find hidden knowledge simply isn't an option because we're stuck in Barovia where I have no contacts and no way of knowing where to look. I would tell someone the same thing if they had criminal contacts or the sailor background. It's not Faerun and most background features simply don't apply.
The new background feats do away with a bad idea that was still always at the discretion of the DM and replaces them with concrete benefits.