Generally the highest speeds aren’t intended for low power devices. They’re targeted at applications where performance is the most important goal and the power tradeoffs are not an issue.
Enthusiast motherboards and RAM kits can already exceed these speeds. Having official JEDEC timings just makes these speed a more universal target for long-term high end designs.
While that's true, It's also true that mobile devices tend to be a rather static configuration during their lifetime, and if you're going to have a fleet of those, having the best performance during that lifetime is a nice bonus. So I believe that form factor specific considerations are still a good value to write about.
Enthusiast motherboards and RAM kits can already exceed these speeds. Having official JEDEC timings just makes these speed a more universal target for long-term high end designs.