Sorry but sounds like lame excuses.
- if people send form exchanges they will also not get the intended earnings
- code and test it properly and it will work - Solidity is only a java dialect and it works!
- "if players change their address"? how to change an address?
- "if code gets stuck" - see my second point
I was referring to protocol uppgrades, the new release of ethereum will be soon, and if they mess around with the protocol, who knows what kind of errors might arise.
Especially since the current architecture is weak, the wallet software is crashing constantly, so i would not be surprized.
It's better to have safety features in a contract, than to be sorry later.
Ethereum is still alpha version, remember that.