In theory, I must disagree with you. However, in practice you may well be right.
Theoretisch muss ich Ihnen widersprechen,
in der Praxis haben Sie vielleicht Recht.
Kalman found in practice what Wittgenstein discovered decades before.
Kalman fand
in der Praxis wieder, was Wittgenstein Jahrzehnte vorher entdeckte.
in theory a thing of beauty, but in practice a load of shit.
Also theoretisch ganz schön, aber
praktisch eben scheiße.