Asking users to go out of their way to install and use something that looks and feels identical to what they already have for reasons most people don't know, understand, or deeply care about and do not get surfaced in any meaningful way is not a winning strategy. A case has to be made in the battle of perception and the decreasingly small visual differentiation hasn't helped build it.
Al Ries's laws of marketing and branding and Donald Norman's models of differentiation apply equally to all products regardless of the economic and institutional structure that builds them.