Yes, of course we will lose our coins if we choose the wrong wallet that doesn't match the coin. Indeed, there are many new coin projects currently running on the Ethereum Platform, therefore the most popular now is the ERC20 wallet. But there are also Cryptocurrency projects that run on platforms other than Ethereum, so this is where we need our precision before we decide to send coins or tokens that we have. We must make sure, which wallet is suitable and compatible with the coin, so we don't lose the coins that we should have