So 3 different kinds of 'likes', the latest green one, 'best answer' is still in a test phase. Any changes, that's the one that will go. Will see how it's used\accepted during future months. Please post your opinions about it here, which like do you like :O)
About layout > f.ex. button closeness (applies mostly to phones\tablets) it won't be changed ftm. The current forum program is moving thanks to a collection of bits, gaffer tape and roadside fixes to still make it run, very sucessfully, but there's a limit\wall\ditch on the horizon. A new SMF forum program is coming (during next year, hopefully?maybe?), modernized and upgraded to align with all the tech\internet evolution we have been seeing happening for a decade.
Until then, the less internal changes (layout, additional features etc) done to the current version > the less potential problems when one day doing the upgrade.