Penstemon cuttings in water

I attended a talk last year where the speaker claimed the roots produced in water are not of any use to the plant when it is subsequently planted in soil or compost. Do all of the penstemons you rooted this way survive when potted up?

Please read my blog, I've just this minute posted it! YES they do survive, the proof is to be seen in my garden, I planted out about 8 water-rooted Penstemons which are still flowering now!