Everyone is a gangster (Rajdhani, Shatabdi, Tejas) until the real Gangsta (Vande Bharat) walks in 😂 - Mushfique Khalid

The coaches are a very important, but not the most important. ICF coaches are 'less' safe than LHB coaches, but they are not accident prone failures that keep jumping off tracks all the time. Simple addition of CBC couplings can make them almost as safe as LHB coaches in most moderate derailments or accidents as they are anti-telescopic coaches too. Because of the screw couplings, this advantage is negated as instead of being locked together as one unit, the screw coupling allows the coaches to rotate freely thereby crushing them.
There are several logistic challenges required for switching to LHB, which are sadly not in place due to lack of co-ordination between the various departments of IR....
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Primarily, the power supply on the coaches is the main problem. Lack of self-generating equipment, means that all trains have to be run with an EOG car, which both reduces capacity and increases running costs, which delayed their deployment. And the FIAT bogies on LHB coaches were not designed to be used for self-generating equipment, so IR's attempts, though somewhat half-hearted, could not find a viable solution for it and this delayed the deployment of LHB coaches even more. Even now, the deployment is under the expectation that HOG systems would soon come up.
While this was going on, CLW, which had received HOG-capable locos through the WAP5, happily ignored it and spent a lot of time on improving the WAP7 which was giving them problems as it was a 3 phase loco. All through this, they ignored the WAP4's which were operational and had no issues. And they ignored developing a HOG system for these locos. more than 20 years after building the WAP4 and more than 50 years after CLW started using Tap-changers, they are still 'researching' a HOG system for the WAP4!
There is a severe lack of co-ordination between all the various departments that needs to be addressed. Developments in individual departments out of sync with the others are just a way of wasting funds.