To buy transfer or deal bitcoin, one needs a long alpha-numeric mix of keys called public key or wallet address. Its vey difficult to cram this wallet address and this is for one to copy and paste from where they are saved.
To me Bitcoin is very easy to buy as all you need is exchanges that converts fiat to crypto like Binance, Bittrex, etc and pay with your credit card.
Bitcoin wallet is complex but secured. Its easy to use
In conclusion. it is clear that as long as the industry grows, security challenges must be faced