I have and will feed to the end, with a tapering of nutrients without a dead stop.
My opinion is that flushing has possibilities for limited use in hydro setups, and is pointless in soil, due to bound organic particles. I don’t believe in withholding essential substances the plant uses when it’s making calyxes, cannibinoids and terpenes.
Hydro nutrients and commercial interests often lead to excess salt buildup around roots near the end of flowering. Flushing can obviously remove these water soluable salts. The effect from that happening however, may not verifiably help your flowers quality. More research in this field is required.
Drying and curing procedure play a huge part in the final product, and can make an amazing grow taste unpleasant if botched. Average or low quality grows however, can be maximized with excellent and consistent curing.