Actually this TD gimmick is nothing but an excuse to get the funds. ITCM is an TD to test the indigenous engine and sensors but it doesn't mean it cannot be inducted in current form.
TD actually has always been part of the DRDO (or any other scientific research oriented org) working methodology. This is part of your standard operating procedure (SOP). To develop a new futuristic technology and product, first you need to develop your technological capability and your countries industrial capability need to have a certain technology readiness level. That only happens when there is coherent involvement & joint work between your academia & research/applied science. Otherwise what happens, you develop a certain technology, but there is no industry taker within your country, so a foreign company comes offers you money & buy that patent+all rights of application.

This is from an old DRDO presentation from 2015, since then a little bit restructuring have happened but general idea is the same.
Link: http://www.iim-delhi.com/upload_events/DRDO_Presentation.pdf





