Rooting speed from cuttings is a trait almost nobody selects for deliberately, yet it decides how painful the line is to keep as clones later. Some regular lines throw females that root in a week and others that sulk for three, and the difference is heritable. That figure is worth noting as a column in the journal, and
https://breederregularseeds.com makes the case for weighting it in selection alongside the obvious traits. A keeper you cannot clone reliably is only half a keeper.