Don't even get me started on Joi.
I can't see any reason to dislike Joi. AI linked to holography is probably not that far off.
I find the level of technology involved with Joi a little discordant to the Noir tone. For my tastes Blade Runner is about wet biological imposters, not hard silicon algorithms. Not only that but it's another tech by Wallace Corps, I find this monolithic control and creation of everything boring.
I can understand the role she plays in the story, a visual equivalent to the poorly received voice over from the original. The audience needs an exposition machine and Joi fills that role, all be it in a chirpy, annoying fashion.Not to forget the nauseating use of overlaying Joi on Replicants. This is more a special effects issue of needing to look like a special effect.
There's also the role of 'ideal girlfriend' cooks K's meals , if she can't satisfy K she'll phone a friend who can, all while dressing nice and reassuring K they're so, so special. The reveal that Joi is just a product built to fulfil K's needs is hammered home by the billboard after Joi has been crushed. A billboard just outside K's apartment that they walk past everytime they go outside.
The fact that Joi is a tool to allow Luv to track K's movements that can be so easily disabled. Apparently an AI with freewill and self sacrifice? Why would Luv employ such an unreliable tracking system? I mean the Replicant Rebellion are using a pill sized tracker, would it have cost Luv that much to place an independent tracer unit within the remote stick device.
The remote stick device really jumps out from the grimy, broken world. An ultra high tech streamlined device that holds the unique algorithm of Joi as well as a 3d projector (that even works when it's in a pocket), and a power cell. But nobody thought to put that tech in something with a little more protection than an egg shell.
The tech fighting the script.
The whole point of digital tech is it is easily copied and stored. And yet Joi can't have a restore point saved to file in the huge fixed emplacement in K's apartment?
After breaking the antenna on the stick I get that it wouldn't update, but the restore points before that would all be viable.
In much the same way Blade Runner loses nothing, if anything it gains, from removing Deckard's voice over, you can cut Joi out of Blade Runner 2049 and lose nothing.