Hate that Nintendo still hasn't commented on the Joy Con sync issues. I was hoping they would had said something by now.
I figured this would happen, as it is better to not say anything, as to not affect day one sales. If they made an official announcement, that there was an issue, but they had no clue what was causing it, or how to fix it, how would that look to potential buyers? That's not their way, they would rather sale as much as possible, and then maybe fix or address the issue later, if need be.
It may affect 1 in 10, 1 in 50, or maybe 1 in 100. It was really to early to tell. Now with the public getting units, I'm sure we'll get a better understand of how many it may happen to, but I knew they wouldn't say anything, as they've had issues in the past, like the screen scratching issue of the 3DS, that they just replace or fix, and never admit fault. Until this becomes a wide spread issue, don't look for an official comment from them, unless there's an easy fix, then you'll get a mention in a future FW update list stating how it fixes joy-con compatibility issues, but nothing specific.
The real distinction for the Switch's "cards" is that they are a physical medium with no moving parts. This makes them far better suited to a portable device. It is why Nintendo has always stuck to cartridges or cards for its portable devices. Sony's experiment with UMDs on the PSP was a mistake, and they adjusted hard with the Vita. Granted, this didn't particularly improve the Vita's chances, but I don't think the Vitas physical media format was to blame for its failings.
It's all about the long game to Sony, as the UMD's was just another proprietary format to them. No different than Compact Disc, Minidisc, Betamax, or Blu-ray. They just want the next standard format so they can get paid from all those who use it, while "N" doesn't want to pay, so they avoid the formats in question when they can. Sadly, that savings is never passed on to the consumer.
I agree, the NS has no reason for any other media larger than what is being offered, as "N" games just aren't that large, so what is being used should be fine for long term. As you stated, I see price being a HUGE issue with this format, and I also see a HUGE lack of physical media coming as well. I hope I'm wrong on both counts, but when cost and & potential sales are an issue, cost cutting is the first thing that happens, and expensive physical media is normally the first casualty.