For starters every laptop intended for school use should have eMMc or SSD so they have some chance of survival in the classroom.
However, it's the number of laptops right up to around $800.00 that come with a 500 gb or 1 tb spinning hard drive that really puzzle me. Every one of these modestly specified machines would run infinitely better with a real 128 or 240 gb ssd. People who buy these would be far better off to buy a laptop with a small SSD and either a portable hard drive or a couple of good quality flash drives.
I've lost the link to it but I read an interesting article about how the majority of business users only use about a quarter of their hard drive so a SSD would make sense for them as well.
In part I base these ideas on my 'user experience' of having a Windows 10 installation on a 1 tb 2.5 inch Seagate drive. While it has a good 128 mb cache it's painfully slow loading windows compared to a SSD.
While 2019 won't be the year of Linux mass adoption, 2019 might be the year when almost all laptops come with some type of SSD/eMMc hard drive?