Because it's fun, because now you won't have to spend ages trawling back and forth rebuying little ships to move bigger ships around, instead now you'll just buy your bigger ships and teleport them to where you need them to be. Less inconvenience, and less little ships cluttering up the landscape, since it's a stateless transfer, I can foresee a lot of the little ships that were used as ferries to get around to pick up and move those bigger ships around being sold, that means a drop in load on the FDev servers as well. It's win win for them.
They u-turned on offline play, they have so many inconsistencies in the game it's not funny, we still have to resort to excel sheets and third party sites to even manage the most basic of trading tools, implementing even these simple features would be welcomed with rapturous applause by now, but do they? Newp. You want to complain about teleporting ships, get back to me when they've made good on other parts of the DDF, restored offline functionality and made Powerplay, Engineers, Mining and Missions a lot less terrible. THEN you can start screaming the house down about teleporting ships, but right now this is a bit like watching people complain about the lightbulb that blew when the oven stopped working, the plumbing leaks and the front door has a hole in it.
Then that's how it's going to be - Sandro was very clear that there won't be a time delay, only a cost wall, so prep your ships accordingly, if you don't like it, then maybe this isn't the game for you.
Yeah, I may be slightly bitter, but like I've said, watching this threadnaught unfold is like being on the outside of what happened with the offline mess, now I'm one of the ones NOT being affected, it's actually rather refreshing