Englishmen never conceived a single state in Indian subcontinent. Indian nationalism was an indigenous ideology. At first place, they prevented country from being too large. Hence, they broken into pieces which balanced each other and never make any sound beyond region.
This artificial balance of power ceased to exist 50 years ago.
Northeast India and Eastern India are among highest growth regions in India. South India is aging and is more of service based except few high end industries like aerospace, North is transitioning into middle income and more office jobs. Hence industries are shifting to east.
LOL why so much hate for no reason? Pakistani syndrome of looking cool just by badmouthing India hasn't made any of neighbors a "regional power".
If Indian products are garbage, what Bangladeshi products would be?
India has machines, vehicles, boilers, reactors, appliances, softwares and lately toys, ICs and electronics.
Bangladesh doesn't have any notable industry except textile which is a low end sub modern system. It's R&D and scientific capability is almost zero to create any new sector. Connectivity to India and gradual shift some Indian companies to Bangladesh is only going to help it because a low end industry and saturating population will entrap BD into middle income trap forever.
en.m.wikipedia.org
If Bangladesh didn't have any benefits from India, it would have pulled away long ago.
LOL, Bangladesh doesn't have a military to knock anything beyond its frontiers or even handle a large scale insurgency within country if emerges. For Indian military, it isn't even a problem and is effortless to make a route from within Bangladesh in days if not hours.
Geography what brings mountains and lot of foreign powers for protecting Pakistan doesn't favour BD. Probably why BD mostly chooses to keep quiet.