Well it's been guaranteed since 3.7 which came out in 2018, and 3.6 reached end-of-life in 2021, so it's been a while. I could see the advantage if you're writing code for the public (libraries, applications), but for example I know at my job my code is never going to be run with Python 3.6 or older.

Yeah, if you have that guarantee then I wouldn't fault anyone for using dict, but also wouldn't complain about OrderedDict.