There's a big difference in aligning security standards and immigration pre-clearance.

Security, honestly, I think in India has long been much more thorough than most Western countries. I see no reason for someone flying CDG-BOM-AMD to be re-screened at BOM. Or - worse - for someone flying AMD-BOM-CDG to be re-screened at BOM. I suppose it's a question of signing agreements and whatever, plus out governmental paranoia. I mean do you trust your own exaggerated CISF security that little that one can't even fly within the country without being screened at every possible step?

I can fly to from and through several countries with just once security check at the point of origin. But can't do a simple connection within India without screening at the connection point.

I believe this initiative is for that - which I'm all for.

When it comes to immigration pre-clearance, it's a different story completely. There are situations where it makes sense (Canada-USA, UAE-India) and many where it does not ) UAE-USA, India-Anywhere. When there are many flights from a few places in one country to several cities in another country (like Mexico-USA, or UAE-India, it makes sense). Enables flights to places in the destination country without the need to convert a little airstrip into an international airport and alleviates queues at arrival immigration.