Not surprised. I met with Samsung for work purposes to buy hundreds of phone, and the best they could do with their flagship phones was offer 3 years of security updates. This was around 2019. Apple, who didn't meet with us, was around 6 years from our estimate.
From a ROI, for corporate phones, Apple iPhones had a longer lifespan, which is why we bought hundreds of iPhones, and not Androids.
On a personal note, I had the Nexus S, the Nexus 5, and they all died a horrible death either from lack of updates, or just having the physical button break, and the microphone stop working.
And let us not speak of Sony Xperia Z5, which all of sudden removed their fingerprint sensor due to a North American patent problem. They also broke their bluetooth audio so that song names STOPPED being displayed. That was all in a span of less than 3 years.
Never again Sony Android phones.
At that point, I got fed up of custom ROMS and joined the "iPhone, it just works" group and moved on.
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