There have been many frameworks that offered this and some still do. But it comes at the direct expense of design discipline, branding, and user experience optimization -- all of which have been elevetated to high concern over the 15 years or so.
Cross-platform "Native look and feel" currently works for some no-nonsense professional utitlies and hobby tools, but mostly makes software that's hard to sell, document, or support.
Most have just opted for common widget libraries instead, and frameworks have stepped up by providing rich libraries of such widgets and prioritizing features for customizing or complementing them even further.
