The LATE public alpha of Valheim have all gameplay loops and is working well.
Iron Gate did not have to make their early alpha (the one unfinished and bugged) public. That's the main difference with CIG.
And about the 'alpha excuse', when someone makes critics of SC like it was a released game, he can't be surprised to be served the alpha reason.
A. Look, this game looks like an unfinished game !
B. Yes, because it's unfinished.
A. But CIG said you can play it !
B. Yes you can play the unfinished version
No, I do not think anyone gets surprised by the "alpha excuse" to explain that SC is broken and incomplete, that is precisely the point.
The issue here is not that Star Citizen be an alpha and therefore broken, but that it has precisely been an alpha and still broken and incomplete for over 10 years and 400+ million paid for with no fixing or release in sight for at least several years.
So the discussion is rather:
A. Look, this game has been broken and incomplete for 10 years and there is no end in sight for when it will be fixed and released!
B. Yes, that is because the game is still broken.
A. Indeed, that is what I just said. But it has been like this for 10+ years already and 400+ millions have been paid for it and wasted!
A. Yes, the game is broken because it is broken.
B. ...
To add insult to injury CIG seems to be doing its utmost to contradict the more ardent backers using the alpha argument by treating SC for all practical purposes as a released product, be it by selling it as "playable now", or by stating via customer support that SC released as Early Access back in 2016, or by arguing its legal defense against refund suits on the fact a product has been released, or by Chris Roberts paying himself, his family and the Calders some handsome dividends usually reserved for cases where products have actually been released and generated profits after tax.