Well, that's a rather one-dimensional review of someone without access to all the facts and variables!
Balancing diabetes can be one hell of a mountain to climb if your life is not structured around the Mon-Fri 9-5, 3-meals a day, I only drive 2 hours after eating and bolusing scenario. And then if you chuck in other aspects like illness and/or stress, etc., you can forget your "If you can wait 4 hours until the last dose has worn off..."
For example, I'll test first thing in the morning, then maybe get a chance to do a little exercise, then have breakfast, etc., but some mornings I need to drive less than 2 hours after eating and bolusing. So, I test my BG and guess what? Yes, you got it, I'll be way above my target range!
Well, if you're struggling with control you can easily get blinded by and lost in the sheer volume of data - and so, if you're not perfect (and who is?), you can find yourself reacting and over-reacting to BG results that really shouldn't be recorded,but have to because DVLA require it.
Yes, I know, one could have a second meter specifically for the car, but then you may have to find a GP who's willing to prescribe more than one set of strips (if the meters aren't the same)... and you'll have to remember to order them as they run low (or maybe you'll have to buy them), and what if that meter is not so accurate because you're faced with buying them and you're not a big earner and so you go for a low-cost model?
One size does not fit all.
Yes, getting back to basics is an essential element to gaining and retaining control, BUT it is not as easy or as straightforward for everyone as your reply implies.