My cynicism was directed mostly at the "plush" etc. descriptions...
Given that India has a mass of very bright talent, it seems odd that it won't design and make it's own modern train sets from scratch?
Maybe some key components have worldwide patents on them?
It has more to do with saving time and resources and avoiding reinventing the wheel, if they can get it for the right price with rights to innovate based on the acquired technology. IR shops have done amazing things by refactoring the technology pieces acquired to create equipment that fits Indian conditions and conditions in other countries where they have successfully exported equipment to in Asia and Africa.
Sort of like, one could either start building something based on acquired computing platform and OS technology, or insist on building the whole thing ground up in house. The latter makes less sense than the former if you can get the right conditions with the acquisition made under the former process.
For example, the WAP-7 Class electric passenger locomotive is an Indian developed derivation from the WAG-9 freight locomotive and the WAP-5 passenger locomotive, both of which were imported initially with technology transfer and derivation rights. Now both WAP-5s and WAG-9s are manufactured in India and in addition WAP-7s have become the passenger workhorse with better acceleration and operating characteristics with typical Indian passenger trains than either AP-5 or AG-9 are.