Ah.
I haven't watched the video, so, that makes sense now.
With that in mind: "Boom! You're toast!" and "Boom! Your toast!" both have contexts in which they're correct, and if the watch in the video isn't in daily enough and/or this kind of phrasing isn't part of the normal wearer's writing on the device, then it likely didn't realize what the "correct" context was.
I've now realized that an entire generation of people who grew up texting shorthand and have no idea how to spell are now writing the source code to the operating system.
I think that "the kids can't write these days" is both outright wrong and a really bad mis-diagnosis of the goings-on at Apple and Microsoft. In my experience, people dropped T-9 "txt-speak" the literal instant they could, once touchscreen phones like the iPhone and keyboarded featurephones like the LG EnV and the like became available.
The other thing to realize is, the people in that group who had T9 phones
as children or teenagers are basically in their 30s now. There's definitely informal shorthands that exist to this day, but let's be real: That's never been a tech thing and it's always been a young person thing. Plus, use of or knowledge of a shorthand doesn't necessarily mean someone has poor command of a "real" language.
The other-other thing is that command of a programming language doesn't necessarily imply command of a human language, same with the reverse. They require different kinds of thinking and problem solving.
The
other-other-other thing is that largely I think it's (as above) badly mis-diagnosing the problem with Apple (and Microsoft) to say that "kids these days" (who are probably the same age as you are) using shorthand in some contexts is what's causing problems with the OS.
It's been noted elsewhere but Catalina is a relatively big upheaval of a lot of long standing technologies (Which Apple has been telegraphing fairly clearly since 2002 that were eventually going to go away) and at the same time adds a bunch of user-facing features to the OS. The rest of the ecosystem (watchOS, tvOS, and iOS/iPadOS) are subject to what happens on the Mac because they all share the same core technologies.
Add to that, that Apple hasn't been breaking its release pace for several years and continues adding to the platform.
The only reason it works at all is likely because most of the core OS (kernel, etc.) is still based on legacy code from the 90s,
In my experience, at least on the Mac, things Apple doesn't care about have rotted BADLY and work way more poorly than they did ~5-10 years ago. Have you burned a CD/DVD/BD since 2010? Since El Cap or Sierra or so it's way worse than it used to be, especially if you like using disk images to get things ready. To add, Apple never added DMG templates for disc sizes provided by HD-DVD and Blu-Ray, even though those burners have been supported by the OS at least since 2009.
NFS is also broken in OS X and AFP has atrophied badly since the switch to Samba in 10.9 or so. Not to mention that Samba is still kind of weird in OS X. For example, to this very day in Catalina Apple warns you that enabling Samba for your account causes it to use a less secure password storage method.
Apple deserves the criticism they receive about the OS, but we shouldn't be pinning it on kids who use shorthand when they're texting or IMing with their friends.
I could go on, but it'd be too political
Just as a heads up, by the time you've posted whatever made you think of this phrase, you're
probably stepping on or over the line already.