what exactly is the problem with multibit? I have multibit HD and quite like it, I can swap it over to electrum with my seed without any problems, do you still not recommend sending funds from a multibit (HD) address? I mean, I thought the only requirement is to control the private keys, a trezor does that, right?
We can't possibly test and review every single Bitcoin wallet and add it into the list. The main principle is as follows:
If you own the private keys to the address, then you can invest from it, regardless of the wallet. However, a huge amount of users don't even know what private keys are. Therefore, those should stick to the recommended methods in order to reduce the chance of doing a possibly fatal mistake:
https://bitcointalk.org/index.php?topic=1917456.msg19226871#post_gen.