I find that Windows 10 performs faster on the same hardware than Windows 7. Faster bootup and shutdown times and faster program opening times.
The hybrid boot (and maybe even without it) may be faster at startup, but is shutdown time that much faster? Or does it just seem like it because it blanks the screen almost right away and continues to shut down in the background? Either way, IMO that's a negligible advantage. Many if not most business computers are not shut down except for occasional reboots. So that improvement doesn't translate into much of a $$ advantage.
Personally, I haven't noticed faster program opening times, but even if so - I suspect many employees tend to open the 3-5-15 programs they use the most and leave them open throughout the day rather than constantly closing and reopening. That's what I see at my FTJ's 180+ users anyway.
Nevertheless, on a day to day basis the actual speed of a computer (as long as it's not ridiculously slow) booting, rebooting or launching programs, is overrated. Put a brand new, "fast", computer on an employee's desk and they'll be pleased for a day. Maybe a week. Then they get accustomed to it, start noticing again how long it takes to do something, instead of remembering past slowness, and before you know it - they're complaining again.
And let's face it, even if Windows 10 were to save the average employee the unlikely amount of 10 minutes per day (granting faster booting, faster program opening, maybe other things faster), I doubt the employee will be noticeably more productive with that "found time", nor will the employer save 10 minutes in payroll per employee.
It would take the incremental value of a "faster" OS a very long time, if ever, to offset the time/money spent by employees complaining about changes, hunting for missing stuff, trying to get Edge to do what IE already does (and it probably won't), and just general delays for the average user to figure out how to do whatever was easy for them to do in the past. Will they figure it out eventually? Of course. Is it worth the pain of forcing them to do that? Not yet.
No, there's has to be something other than a little faster speed to make it worthwhile to recommend a migration. Businesses speak the language of dollars and cents. Unless we are able to articulate and demonstrate a real value in migrating to W10 through measurable productivity gains or measurable savings, there's no reason to recommend it at all.