Bitcoin is unique to me because it is temper proof and time stamped, I will also say because it has no physical representation yet it has much more value than fiat and it has become the biggest inflation resistant asset and currency of all time. The uniqueness of Bitcoin is so much that it affects even fiat to a large extent.
Are you referring to tamper proof? I find Bitcoin unique because of its ability to rebound or recover after crashes and recording new ATH every 4 year cycle. The transparency, decentralization, isn't that unique since many other crypto has also that feature, if ever, aside from what I stated, I believe security can be the major reason why Bitcoin is unique.
It is not all coins that is decentralized and transparent as they claim and you know about this. We should applaud bitcoin for being truly decentralized. And again as you stated, the ability of bitcoin to rebounce after several crashes is very unique. It is very rare to see a coin that will crash more than 70% and still survive. Bitcoin holds a very good record for that.
Taking about fighting inflation, well I can say it is so but I still have my doubt about this for it will be a topic for another day.