So my question is what exactly makes this phone so special, because based on what I have seen there isn't anything so special about it, unless maybe it contains more security features than other phones in terms of storing your bitcoin and other crypto assets.
But, I don't have interest in it, I already have a hardware wallet that I'm making use of and I also have a very good phone, so all these things doesn't really matter to me. And another thing I don't like is that the phone is costly, but whatever
It's just marketing, don't fall for this. You can get a Xiaomi Pocophone F1 (same CPU, RAM, storage and better battery capacity) for 300$ then buy a ledger nano S or Trezor and have around 250$ left.
You are right, this is more like marketing. I have big doubts about storing crypto on phones. It is not reliable and not safe. For this purpose, specialized devices are better suited - hardware wallets.