Each to his own, due diligence is called for.
Talking re T2s only...
Each of us has to find a way that is best for us as individuals.
While testing can and does provide information, some may find they get too obsessed with it and it starts ruling their lives (which is very different to it being an aid to controlling bg)
If it can be an easy and natural part of one's life and routines, all well and good.
But, once the initial lessons of what spikes and what doesn't, have been learnt, then for some they may not want or need to carry on testing too often
for them.
Me, I'm happy with once a day (in normal times), it fits with my routine, I glance at it and then carry on with the rest of my day.
I could move to once a week, or a month, or even irregularly , but I like that casual daily check. However if it starts to rule my life in any level that I'm not comfortable with then I would review the situation.
There are people who may not have that level of self understanding and/or for whom it brings negative emotions and reactions. If they can keep their bg under control without testing then let them be.
It's only a tool.