That’s not true, some don’t produce much , others produce way more than primocanes, but all taste fantastic. I cut all mine down last year in an attempt to renew my plants, that didn’t really work, so never again. they seem to do better with the energy from floricanes, the plant can produce sugar very early compared to growing new canes, it could be a month or longer before the plant can produce sugar.
I do remove the top 1/3 as that has fruited, the lower 2/3 are the only part that will fruit. Floricane crops are usually bigger than primocane. Some cultivars do poorly from winter damage, but the hardy ones produce like crazy. After all 2/3 of the plant is producing, not 1/3 like in primocanes.
It does make them harder to manage, but I have summer bearing too, so have no choice in the matter, if I want berries that is. I myself much prefer the summer crop. In fall the berries developed in the cold, are not that good. So even though my plants produce till frost, I often stop picking them before because of poor size and quality.