They didn’t make this change to spare people from spending time online later, they are doing it because mythic raiders will run and roll on loot from current LFR for the transmog. sweaty degen gonna sweaty degen. great… but taking away the biggest incentive for delves right after adding it is crazy talk.
Giving players (new, loyal, returning) stuff to enjoy and work toward in the current season is a good thing.
I’m soloing heroic vault of incarnates now, its a pretty arbitrary restriction, making people wait. transmog groups every day for mythic abberus and amirdrassil, getting fat drops and doing it on several characters.