Tried it, don't like it much:

- icons are thinner than before, making them harder to see (hmm, they're actually inconsistent, some are thick - search icon, and some thin - navigation icons)

- lack of countours makes toolbar input fileds harder to discern (I can still have separate search field, so at least that's good)

- popup menus have no countours either, making them blend into the page if it's white, like most pages are (https://megous.com/dl/tmp/20210422-015250-ff89.webm)

- everything is bigger for no reason

- new colors are meh, looks like random variants of grey + tinted background for the toolbar, which looks very out of place. just keep it grey, it would look less out of place

- a step back IMO