Google Android development closely work with Samsung hardware implementation. Samsung get to implement many of the future Android feature in their flagships first with their UI overlay. So, what other OEMs adopts later all basically Samsung-Google collaboration. That's the reason most of the Samsung flagships do not require OS upgrades since their Overlay pretty much implements most of the good stuffs in the new Android version.What Samsung does do not usually translate to wide adoption.
Heart rate sensor on the phone? Iris scanner? Even the Chinese laughed at those Samsung features. Meanwhile, Samsung is now copying the “notch” (having it not in the middle doesn’t mean innovation). And many Chinese phones already have in display fingerprint scanner.
Samsung is just a follower now, to the point that they start ODM-ing phones, ie having a Chinese company make the phones and put Samsung brand on it. Samsung even does a complete lineup to copy Chinese phones, the Galaxy M series, complete with tear drop notch copied from the Chinese phones.
Samsung curved screen gets adopted, punch-hole screen is not Notch but it has its own drawback. Industry leading AMOLED display pioneered by none other than Samsung. Their UFS is being adopted by flagships from other OEMs, their indisplay finger print reader uses different tech than most of the Chinese OEMs using it. Their Samsung Pay is a real neat, innovative NFC payment solution than Apple Pay.