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That said, it seems like there's some fun abilities to exploit

Board Clears that Clear Multiple Permanent Types (Coastal Breach, Consuming Tide, Devastation Tide, Rivers Rebuke) Returning all nonland permanents to players hands is always going to have a huge impact during a game of Commander

MTG head designer once commented on the lack of stranger planeswalkers, saying in a 2019 blog post "we lean towards humanoids because that's what best fills the function of what we need planeswalkers to do"

Another quick aside: All the creatures with changeling that were turned over from design had the ability to change themselves in some way most often by changing their power or toughness (you'd be surprised how many basic ways there are to do this, from firebreathing to Looming Shade pumping to the Rootwalla ability) and all the spells changed something else (Giant Growth, Shrink, Afflict, and such)