You are right some features where promised and they are missing up to now. Like TCP-IP stack. So technically we should all expect to get an update with those feature for free.
But no-one promised us when we will get this update. I'm using MOS every day and some missing features like deficons really bother me. It would help me a lot to get MOS sooner than later.
So if my money would help the MOS team to get the next MOS version finished earlier then its in my own interest. I'm willing to pay to get in done sooner.