This is a quote by a long time ISRO person with deep knowledge of everything inside ISRO:
Jayakumar’s profile:
https://www.quora.com/profile/Jayak...533&share=d9933b0c&srid=IU6B&target_type=user
Jayakumar Chandrasekharan says “ Even though I am from ISRO (retired), I have to admit your point that spaceX is far advanced than ISRO. Let me give a short history of ISRO.
As you know ISRO was an autonomous body under Department Atomic Energy. It was established by Bhabha and Sarabhai in Thumba. The main purpose at that time was to study the magnetic equator passing over Thumba. TERLS was established for launching sounding rockets, and was dedicated to United Nations later.
Later due to the initiative of Vikram Sarabhai, SSTC (Space science & technology centre), RFF (Rocket Fabrication Facility) RPP (Rocket Propellant Plant) were established to broaden the field into sounding rockets and also launch vehicles.
The project SLV-3 was approved first with a small budget and you know Kalam was the director for the project. ASLV, PSLV, GSLV, GSLV MKIII , RLV followed. Thus ISRO’s growth was gradual, and over 40 years, unlike SpaceX which started with a Big Bang.
India is always behind west by about 50 years in technology and manufacturing. We are behind Japan and China also. We are not self sufficient either in manufacturing technology or materials in Higher technology area. Even Cars manufactured in India have some import content.
In Rocket technology also such constraints are there. The developed nations simply deny us the technology or material. Therefore We have to innovate and find methods and materials to overcome these abrupt refusals. Remember the accident in which a malfunction of a simple O ring blasted the rocket along with Astronauts.
These type of constraints are not applicable to SpaceX. They have advanced technology, advanced materials, sufficient qualified and experienced personnel and moreover limited controls being a private company.
We are yet to master cryo technology fully, even though we have made cryo engines for upper stages and satellites. “
And you can see the upvotes by ISRO scientists and engineers to the above quote. ISRO simply does not have advanced talent. They are still unable to master cryogenic technology for heavy launches. And that is a fact.
Also his reply to further ISRO recruitment:
“ Yes. Government has advised ISRO to stop recruitments for scientific and technical posts.”
This observation alone says that the government has lost confidence in ISRO. It was bound to happen as ISRO is yet another PSU unable to compete with current talent. Over and out.