I do think that for certain people (high susceptibility to binge eating or compulsive eating; strong surge of dopamine from ingesting simple sugars), the above rule is the way to go!
I actually think it's kinda sad that people sometimes mistakenly think something is wrong with them if they are the type who cannot ingest refined sugars without triggering cravings for more such sweets. I don't know what percentage of people that is, but I go back to the phrase that this is a battle that our bodies were not designed to fight.
Simple sugars (fruit) do exist in nature, and most humans can incorporate fruit into their diet. (If stopping at two pieces doesn't happen naturally, then put the manual brakes on. If you're eating more than 14 pieces of fruit a week, it *may* be that you've allowed fruit to serve as a stand-in for the compulsive eating of refined sugars that you used to do on a SAD diet. Not necessarily, but *sometimes* this is the case!)
But refined sugars (including pulverizing dates in a blender, synthesizing tree sap into maple syrup, or turning the stevia leaf into a consumable powder) can take power over a person's appetite. If you've ever eaten more than you originally intended, of substances containing refined sugars, then there is *some* susceptibility to the addictive powers of refined sugars.
Depending on each person's level of susceptibility, you may or may not be able to keep sweets in the house, may or may not be able to eat the occasional off-plan sugarbomb (e.g. piece of birthday cake), may or may not be able to recover quickly if you *do* ingest refined sugar. Joan Ifland, who does a lot of work on food addictions (but has nothing to do with the WFPB community), says that it takes four days to get refined sugar out of your system -- until you have four days without refined sugars in your system, you don't know what it feels like to be cravings-free. (I am only talking about those with food addict susceptibility).
I once lived with a guy who was like Doug Lisle -- he would open a pack of sugary junk food and eat one, and leave the package on the counter, and just walk by it all night. The product would go stale -- that's how little he cared about sugar. Wanna guess whether I gained weight living with him? Yep.