Is it then a good idea to have these features at all if they introduce new risks? I believe so, they enable many interesting projects that are hard to develop on other blockchains. The growth of Ethereum is an attestation to this. As a consequence, many skilled developers are now creating solutions to the (relatively minor) remaining issues.
For bigger issues, like privacy and scalability, no-one has a good answer yet. The Ethereum community is working on promising solutions (Casper, Plasma, zkSNARKs, eWasm).
Hah wow you weren't kidding. Amateur hour.
To add to your list: no checksum for addresses. If you typo the recipient address, the client will happily render your ether unspendable.
Also, there are checksums for addresses: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md I don't know anyone who would manually type an address though.
While you may not know anyone who manually types in an address, there are plenty of stories about people who do (and make a typo) on reddit & other discussion boards.
Not too much work to raise hundreds of millions of dollars, though. Ofc something so simple is an EIP.
Contracts can be changed if they're made upgradeable. The execution environment is Turing Complete, so it's up to the developer to make contracts secure, upgradeable, etc.
The protocol has so many other issues.
Anyone who has worked with ETH will tell you that it isn’t really designed as a currency.
A large chunk of the transactions are exchanged who must transfer deposits to other addresses.
This is a hack that everyone does because Ethereum doesn’t allow you to send from multiple addresses reliably.
Also tracking deposits from contracts is a nightmare. The nodes don’t work well at scale. Contracts can’t be changes (so you have things like the issues with parity multi sig contracts).
The list goes on and on.