Therein lies a problem.

It has changed in the last 5 years in leaps and bounds. Mostly around user experience and expectations, but software bloat and lack of optimization has meant that these devices have a need beyond a 5 year old chipset.

That is if you are actually using these devices as intended. If you're just setting up a terminal and checking out your uptime; you're fine. If you're using modern apps and social media apps, you're not fine. If you're talking about making a phone call, you should be fine. If you want high resolution video conferencing using something other than wi-fi, you might not be fine. If you're streaming music, you might be fine. If you're streaming videos, who knows.

Simply stated, what you are using these devices for and how it may be used to replace a desktop/laptop, that's where I would start. If you were to state simple use cases; you might be fine whereas I would not.

And mobile devices and capabilities have scaled considerably in just 5 years.

Sadly, so has the code that supports these aforementioned tasks.