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All design people live in Macbooks and iPhones, so every UI not following current Apple theme feels off to them.

Really? Google created their own design language and guidelines: https://design.google/

so it can't be all Apple's fault.

It's not Apple's fault, it's the desingers who use apple products. Look at youtube account linked to that page and tell me how many Windows computers can you see there: https://www.youtube.com/playlist?list=PLJ21zHI2TNh9clapWNyWU...

I've also seen this trend, and if you hate Apple style UI (like I do) this trend is infuriating