WoW also does similar things to this; see the end of the article. It's good that they specifically relate it to losing items/gold, since many players actually may not make that connection, and may not think the risk is as big as it is.
332 karma · joined October 31, 2018
I'd say it's moreso a trade off that favors "getting it out the door quickly" over security. It's reasonable that, if you want your app to integrate with a Google Home, you should expect it to be authenticated. Plus, the fact that this API is undocumented seems indicative that 3rd-party integration wasn't the purpose.