This is what happens when you treat "IT" as a cost centre and outsource it to India with TCS, Tech Mahindra, Wipro, Accenture etc. In the case of BA; its Tata Consultancy Service (TCS).
I can't comment on outsourcing to Phillipines, Ukraine or Malaysia.
I've worked with two companies that did their outsourcing to India and it was a shitshow.
First and foremost there is the cultural barrier, sure India is a very Anglicized country but it has so many localised languages (Malalayam, Telugu, Tamil etc.) and cultures that means communication between one IT centre in Bangalore is very different to one in Chennai or Pune. + Compounded with the fact that outsourcing companies distribute the work between IT centres in different regions, it can be hard communicating and organising work.
Secondly, there are brilliant Devs/Testers/Analysts in India but they move around a lot because the pay is so terrible. Therefore a lot of undocumented knowledge gets lost which inevitably causes problems when doing maintenance or solving outages. One week you are working with a brilliant person, the next week they are gone.
Thirdly, the sales people at many outsourcing companies are brilliant. They promise the world, then for the first three months keep the clients happy. Then there is always a slump in service / performance as the "dream team", the sales people use to wow the clients move onto the next company they are trying to woo.
Fourthly, when the offshoring occurs, the transmission of knowledge sharing is very hard. The local people who are being let go won't be too facilitating in this documentation as well which is understandable.
Finally, just the geographical aspect. Teleconferencing, skyping etc. really adds an overhead and slows down productivity.
I'm going to finish with an anecdote, which makes you really appreciate the contrast. I was working on a project, reviewing code submitted by a dev from offshore. This was during monsoon season, a couple of days later I found out the person died in the monsoon due to a severe localised flooding in the place he was living just outside the city. I live in Scotland which is a wet place, but we don't have to worry about drowning or losing our homes to flooding in most cases :(