And the Devs clearly stated in the livestream they were playing on a previous pre-alpha build to the one currently being worked on (if I recall there was mention of various iterations of builds). What we get on 29 Mar will be a more advanced state, albeit still with work to be done (maybe a LOT of work), being alpha. Why should we be talking beta at this point? I hardly think that the typical development cycle or timeline is locked in stone - it is up to FDEV and no-one else whether they want to consider what we test is an alpha. When the game initially released we even had a gamma phase before release. For all we know, given the time left before release, we may not even see a beta, but perhaps go from an advanced alpha state (assuming the alpha will still be phased as originally proposed) to release. Just depends on what needs to be fixed (or can be fixed within the remaining timeframe before release). And it's not like we'll suddenly see improvements cease on release. But of course, the naysayers will always focus on the negatives.
Don't get me wrong, the gameplay showed there's still a lot to be worked on, but being a pre-alpha version it was always going to be rough in places. And clearly the CM team were hamming it up in terms of the comms, unnecessary attempts at stealth when entering the base etc, for effect. Whether it was underwhelming is subjective, and based on what you were expecting. If you were expecting Battlefield, COD, Division 2 or something akin to these, more fool you - this was never going to be on par with first rate FPS or 3rd person shooters. On the other hand, if one's expectations are tempered with the knowledge that this merely adds a new dimension in terms of gameplay, on a game focused on ship gameplay and mechanics, then it becomes a tad more promising. While I would love it to be a Div 2 cover-based gameplay, I'm not particularly disappointed that it's not. And I'm even more stoked there doesn't appear to be, thus far, signs of stupid invisibility and crowd control mechanics....
Not everyone is going to, nor needs to, agree with FDEV's implementation of on-foot gameplay, but that's really no different to the Elite: Dangerous we have now - it's not to everyone's taste. If one doesn't like what FDEV are doing, it's a pretty simple solution - don't buy it or play it.