I do have Storm King's Thunder handy. I am not going to go page by page through that adventure though, because you already demonstrated that's mostly a waste of my time as you will just dismiss it as "one adventure". But I will say the adventure does have similar references all over the place to random encounters, it has a huge section in chapter three on the topic, it gives some guidelines on how to use it, and includes this text:
"Characters exploring the North are likely to encounter wandering monsters. Such encounters can occur as often as you like-but keep in mind that too many random encounters can bog down the adventure and cause players to lose interest in the story. You can roll on the Random Wilderness Encounters table or choose an appropriate encounter. Each encounter is described in more detail after the table. For guidelines on how to use random encounters effectively, see "Random Encounters" in chapter 3 of the Dungeon Master's Guide..."
And then it proceeds to provide a truly huge list of random encounters and variations based on the terrain the characters are traversing and a change for percentage odds based on that terrain, including Forest, Grassland, Hills, Moors, Mountains, Roads, Trails, Sea, and Tundra. And every one of those encounters has a full write-up.
Then there is a second section just for Ice Wind Dale random encounters, with similar level of detailing.
Then there is a third section just for random encounters during Air Travel.
There are also several multi-stage combat situations and patrol situations that can also put constraints on too much resting.
Now you might say that most of these are non-dungeon oriented, and you'd be right. But, that's because this adventure is non-dungeon oriented. It's an adventure that involves a lot of travel, outdoors. So the encounters are tailored to the adventure. But if you try to overdo resting during this adventure, they've given you the tools to interrupt that, and to keep the adventure moving and drain the character resources if they try to do that.
And it's not some huge burden on the DM. There is no need to reinvent the wheel. If the issue arises where you as the DM feel the party is resting too often and the adventure is bogging down from that or meaningfully being altered because of it, the adventure gives you an easy tool to use to address it. All you need to do is roll either a percentage dice or d20, depending on the location, and you have your random encounter to interrupt the rest with. Or you can skip that step and just choose an appropriate random encounter. Either way, not a lot of burden on the DM there, as the adventure writer went to a lot of effort to create some detailed encounters for you to use, complete with descriptions and stats and tactics and treasure and terrain suggestions and everything.
I hope I do not get another "but that's just one adventure" hand-waive response. If me looking through the two adventures I have here (and it's not like we're talking about a looooong list of adventures that are out for 5e) isn't enough to demonstrate this issue is in fact considered by both the rules and the adventures, then I'd suggest you're trying to "win" an argument more than actually get to the bottom of your question regarding whether it's an issue that's addressed.