Why has IIT Delhi made its PhD admissions so hard?

IIT Delhi Ph.D eligibility criteria are as follows:

• Passed M.Tech/M.E/M.Sc/MBA degree with minimum 60% marks 
• Or, B.E/B.Tech with a minimum of 70% marks in the concerned discipline.
• Must qualify for GATE/ CSIR/ UGC NET/ ICAR/ DST INSPIRE fellowship

The admission has been made challenging to shortlist minimal candidates that rightly qualify for the degree instead of shortlisting many. Although we can say that CGPA alone should not be the only criterion, maybe they might already be getting enough applications that can be filtered out using criteria like CGPA.

Now, Stanford’s Ph.D. eligibility criteria is a TOEFL cut-off of 113/120 for MS in CSE. One might think that the TOEFL is an irrelevant criterion for a Ph.D. but it is necessary as you will have to read and write papers in grad school. This criterion showcases the holistic eligibility criteria of US admissions in contrast to Indian admissions.