Honestly, none of the ones listed thrill me, though the MailChimp one isn't bad. The rest range from unnecessary (really, "Dunkin'"?) to the unfortunate (I frankly liked the old Animal Planet logo) to the outright ugly and brand-damaging (looking at you, Best Buy).
Significantly change logos when (a) what you have is ugly, (b) what you have is forgettable, or (c) what you have no longer reflects who you are. Otherwise you are, at best, simply enriching some very expensive advertising / image agency (who will always be willing to do a major redesign for you, ch-ching). Redesign for the sake of redesign rarely ends well.
The 13 Best and Worst Logos of 2018
Some of these rebrands were long overdue. Others did not go over well.
Chat sex
Good movie
TAERWEF
Chat sex
Good movie
TAERWFDW
Chat sex
Good movie
TAEHRGWQ