Well, no one does that except maybe for parks with several thousand signs!
When you buy X solar panels you are not going to sort them to throw away X%! No private individual does this ... even at 1 € per Wc!
Pairing of modules
The modules naturally have different characteristics (even very few) that can create imbalances during their association within a photovoltaic field. This difference in performance between modules of a branch or between branches placed in parallel is called the "mismatch". These imbalances degrade the MPP (maximum performance point) of the series of modules and lead to a drop in usable energy. In order to limit this phenomenon, the associated modules will be sorted in order to have the most homogeneous possible currents. Depending on the power tolerance, this practice may reduce mismatch losses from 1,5% to 0,4% for a dispersion of 10%. In practice, the modules are sorted according to their MPP current as soon as the individual power tolerance of the modules exceeds 8%. This sorting is carried out on the basis of the characteristics measured when leaving the factory by the manufacturers (flash test).
Logically, a good manufacturer does this before putting his panels on the market ...
The rest is commercial bullshit to sell micro inverters I think ...