Correct me if I am wrong,
* You can have bitcoin but if it is not being tradable to fiat currency then your bitcoin has no value at all.
you are wrong because value of something is not defined as its tradability but with its utilities. otherwise how would you explain fiat itself having value since there is nothing you can trade fiat with?
the value of bitcoin is in the fact that you can use it to purchase goods. that means even if you couldn't exchange it with fiat or fiat didn't even exist, you could still exchange it with goods. and that is how value of a currency is defined.
* You need to buy bitcoin with fiat currency without fiat currency you can't have bitcoin
wrong.
you don't "need to" buy bitcoin with fiat, you "choose to" buy it with fiat. it is like saying you "need to buy US dollar"!!!
the real way of gaining bitcoin is to getting paid for the work you do just like the way you are getting paid in US dollar (or any other fiat you get paid in if you are in another country).
* when you buy bitcoin you have to pay services like in those banks and when you like to convert bitcoin to fiat and withdraw it to a banks then you will then again to pay the service of the bank. You need also to pay the bitcoin transaction fee. So fees are everywhere from those banks to bitcoin network deducted by the miners.
that is the same if you had one fiat currency and wanted to convert it to another fiat currency. eg. converting CNY to JPY.
* bitcoin could stand alone without being paired by fiat currency but we should make it paired with fiat to get the bitcoin with value depending on the demand of the community.
repetition of the same argument.