You really need to learn more about bitcoin because your article is completely flawed and inaccurate.
Bitcoins Are Not Widely Accepted
Bitcoins are still only accepted by a very small group of online merchants. This makes it unfeasible to completely rely on Bitcoins as a currency.
Most people that buy bitcoin see it as an asset, that is enough and the reason it is superior to fiat as it is an appreciative asset unlike Fiat that are constantly devalued by the government. The reliability we need is the safety of the blockchain and the wallet we are using, that is why we should use reliable noncustododial wallet like Electrum while cold wallets are the safest, like the Trezor or Electrum cold wallet storage.
There is also a possibility that governments might force merchants to not use Bitcoins to ensure that users’ transactions can be tracked.
Bitcoin is censorship resistant, it can not be centrally controlled, if you are making use of exchanges, you have no full control over your Bitcoin, if you are using noncustododial wallet, you have your seed phrase that generates you your private key, you have the full control over your coin, and this nullifies this your comment.
Wallets Can Be Lost
Store your seed phrase offline, triplicating it is not bad, save each copy (not together) in three locations, store them in a place that is resistant to attackers and damages.
Bitcoin Valuation Fluctuates
That means you are just one of the people that know nothing about Bitcoin, if the price is decreasing, do not sell, leave it, the price will increase back, reach all-time-high again and you will gain. Bitcoin is getting attraction from people and institutions. Do not be surprised again when bitcoin reach all-time-high again and again.
Risk of Unknown Technical Flaws
Which flaws? Mention one. Do not compare the blockchain and nodes to the traditional system that are attacked with malware which makes them not to be perfect at all. Bitcoin blockchain is the strongest blockchain in the world with the highest hashrate generated by miners, so do not expect 51% attack, the nodes will also completely invalidated invalid transactions.
No Buyer Protection
When goods are bought using Bitcoins, and the seller doesn’t send the promised goods, nothing can be done to reverse the transaction. This problem can be solved using a third party escrow service like ClearCoin, but then, escrow services would assume the role of banks, which would cause Bitcoins to be similar to a more traditional currency.
When you know that already, you should not send Bitcoin to a wrong address, also make use of escrow is still perfect in this regard. Also, there are many fiat transactions that once sent, that is all, and the fiat can not be recovered. I am also very tired of fiat dispense error and many other errors related to fiat transactions.
No Physical Form
When it is not needed, the intrinsic value is all that matters. And if you like you can go for
casascius physical bitcoins.
No Valuation Guarantee
This is out of point, the coin that is reaching all-time-high, the most successful asset of the last decade, and yet all-time-high guaranteed. I think you need to learn more about Bitcoin before making any comment.