I am over 50 like most over 50's my eyes have deteriorated. I have a smart phone - never use can't see the screen.
Have on old laptop with 17" monitor use sometimes but need good light and glasses.

cannot use tablets screens too small to see!
My PC has a 24" monitor - fine.
Use landline all the time - mobile call costs and even worse internet access data costs are ridiculous and signal reliability in UK is poor.
I do a lot of photographic work and graphics/web design - no way will I be doing this on low CPU/GPU devices with small storage and RAM - get in the real world
CIO people! Smart phones are me too toys to show of the kids and snaps they are not processing machines. Only other option for small businesses is cloud computing - don't you just love the security and reliability of that?
Docking stations are expensive and laptops still underperform desktops by quite some way in my experience and the costs per GB RAM,CPU and storage are way higher.
My wife works purely on a laptop with docking station but for complex tasks borrows my PC as it is way faster.
she has to network to her office central server to access data bases and aas our broadband bandwidth is at best 1 MBps she is stuffed for security reasons she is not allowed to load data or databases on her hard drive but has to work on them in reaal time on the central server - what a waste of time as it takes hours to load even smal databases.