It's very disappointing to me that, once again, Frontier is entertaining sacrificing good gameplay mechanics for a video game, which is not real life and need not conform to real life, in order to entertain the boring and unfun adherence to strict realism as clamored for by people who frankly have bad opinions about games and realism. The same people who brought us the current iteration of supercruise and its speeds and rates, who seem to really love spending 10 or 20 minutes at a time with the throttle pushed all the way forward doing nothing else, are once again through their sheer whinebaggery encouraging Frontier to sacrifice fun gameplay for no reason at all.
Here: Instant transport works using Witchspace drives similar to those that propel capital ships. The technology is very dangerous and can't be used with people on board, and stations require encryption that only works using a physical card in your space pockets before they'll ship a ship (to prevent theft). It's instant because like witchspace drives they can launch thousands of lightyears instantly.
There, there is a good lore justification for ship and module transfer being instant that doesn't require 3D printing or post-scarcity, is consistent with lore, and most importantly doesn't sacrifice good gameplay decisions in a video game, which frankly should always be the most important. You have already said, you playtested this, and adding a delay added no gameplay benefit. Don't listen to people's whines about gameplay elements, there will always be whiners no matter what decision made (see for example me, right now, I guess).
Next thing these people will be complaining about multicrew allowing players to jump into ships with their friends without first physically flying out and meeting them - which again would be a good gameplay decision that these kinds of people will oppose despite that most of them likely only play in Solo.
Anyhow, I guess I can say I'm disappointed to see that Frontier is going to once again sacrifice good gameplay in favor of vocal people having a whinge about their ~immersion~, but I'm not really surprised as I was shocked by the sheer number of good decisions Frontier was making in 2.2 (for example, printing fighters, which I figured would not be allowed but without which flying a fighter would be far too brief a joy, and which would make that the pro-troll for when multicrew fighter pilots are a thing).