Depends what the individual is trying to achieve. If you’re attempting to reverse already in-situ complications then you’d be surprised how easy it is to be strict. I decided to get cold hard ruthless on myself, and it’s paid off for me. Mainly because I now don’t spend my nights crying in searing agony from neuropathy pain in my feet. Staying below six was instrumental to this...I was able to actually feel in my feet when my levels were higher than six, post-meal. Possibly though vast quantities of circulating insulin rather than the glucose per se.
One person’s hardcore is another’s absolute necessity. I believe also that it’s too common for folk to misinterpret the standards of others as prescriptive advice. When the difference between a rise of one, or two, mmol/L means you can sleep at night, you quickly recalibrate your own expectations, but that doesn’t mean anyone else has to care or follow suit.