Yes it is, the people telling you otherwise are just unaware of its issues

GrapheneOS has a great post talking about some of this: https://discuss.grapheneos.org/d/24134-devices-lacking-standard-privacysecurity-patches-and-protections-arent-private

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I had read this comment and have been thinking about it occasionally ever since. It’s just such an unfortunate situation and gave me a whole new perspective of life.

I had remembered this earlier today and I think I found the video you’re talking about, it seems to still be up, so I’m going to leave it here: https://youtu.be/0Grs_jJ5U6w