I think the OP makes a good reason but it does not mean I have to like their decision.
The Samsung Alpha series is slower but they ditched it too.
Just yesterday, I downloaded the entire I Love Lucy series (180 episodes) in their official YouTube channel using TubeMate. Only the Operetta episode I had to download from a different channel as it was quite blurry found on the official channel. I used TubeMate and it was only at 640x360. For all 180 episodes not including The Lucy-Desi Hour (aka We Love Lucy at 2.55 gb), it took about 5-6 hrs and is 17 gb! Thank goodness for the $50 Nokia Lumia for having a slot as I can't fit much on the Xiaomi. Without a memory slot, a six-seasoned TV series alone can eat up more than two-thirds of a 32 gb device give or take if you actually get 29 gb avail if it wasn't for the firmware itself. And again, not in HD, FHD, 2k, or 4k. Imagine once you start installing apps and other files?
So yeah, while Samsung might have ditched it for practical reasons based on speed performance. It is quite isn't practical in other usage. 4K vids, games, HD movies, etc. I just hope Samsung does not listen to all the APPLE-INFLUENCED critics by providing sealed batteries and no memory slot for the rest of their era. We need options but Samsung took that away from us this year.
Samsung, pls come back to your senses next year. Even HTC brought back the sd slot with M8 & M9 after omitting it in the M7 (except the Japanese variant). Samsung should just brush aside the critics and go back with function over fashion, substance over style. It is much more practical during emergencies and during the longer-run once the looks start to fade and become a novelty in people's eyes.