Where are the Yoga philosophers?

Today I read in Philipp Maas's contribution to Periodization and Historiography of Indian Philosophy (edited by Eli Franco) an intriguing critique of Colebrook and of all the Indologists who, seemingly following him, thought that there was nothing philosophical in Yoga apart from its Sāṅkhya component and that what was typical of Yoga alone was not philosophical.
Is it really the case? Read the rest at my new blog, here.