I worked at large bank who decided to give up solid, predictable and reliable html/aspx pages in favor of silly one-pager framework "to improve user experience"

I worked at large bank who decided to give up solid, predictable and reliable html/aspx pages in favor of silly one-pager framework "to improve user experience". This of course to be accomplished by an army of hit-n-run offshore consultants. Issues predictably ensued multiplied by losses from users who couldn't tolerate this nonsense and switched their trading and banking activities in favor of competitors. I raised this question few times but what scolded by mid-management in fear of being put on a spot for bad business decision. Yet it still keeps happening.