i do want to preface this by saying that i don't have the updated dash. i will also say that if/when i do get the updated dash, i will not be likely to use tumblr until it is reverted or an official option is made to let each user choose. the screenshots i've seen are stressful - on a website that is already rather crowded visually ( especially during holidays or whatever silly little events you put on ), taking away what little void space there is? turning it into a visual clone of twitter and instagram? i avoid those sites because they are visually distressing and overstimulating for me.
on top of that, the shift of everything from a neatly organized dropdown/header bar into two columns - in which main functional links/tabs have been moved to the opposite side from where they have been for over a decade? to match with twitter, which people also hated that when it changed? in a forced update that has no toggle that allows people to switch back to the old format? maybe it is easier for some people - that is fair and i'm not saying it's not better from some people! i am however saying that it is also far less accessible for some people, and you are not progressing by just trading off different forms of accessibility/inaccessability.
also, one of the biggest issues i have with everything - beyond the visual issues and the lack of taking your userbase into account when making drastic changes ( especially unwanted ones, like the reblog chains ) - is the patronizing way i've seen certain staff members responding to people. statements like "you'll get used to it", or "i didn't like it but now i do" ( with the implication that users should just get over it and like it too).
i don't know, i've been just dumping my thoughts and this may not be terribly cohesive, and it's far from all of my thoughts, but i needed to just get some words down.