> Workers have their own interests that are not necessarily aligned with those of the users/society
Usually you will find that they are, because workers are also users and vice-versa.
> support working hours only from nine to five on business days, higher pensions and fewer new hires, more job security
I guess you're from the US? "Higher pensions" should have nothing to do with a company: that's a public policy matter and pensions can be mutualized across employers as is the case in France (despite past & present governments doing their best to dismantle that public service).
The 8h workday is established minimum standard across industries for over a century now (several centuries in some industries/places), and even when it was not (see Haymarket affair) it was considered a pretty weak/useless demand, more symbolic than anything. Thinkers of the time advocated that given the established technological progress at the time, it should be possible for everyone to work just a few weeks every year and still enjoy modern comfort. Some more modern thinkers believe the same applies today, considering how many resources/efforts are wasted annually.
Moreover, "fewer new hires" is not necessarily correlated to "more job security". It may be true on the scale of a single company, but on the scale of a whole society, a public policy of everyone finding opportunity for their contributions to humanity (that rarely yet sometimes overlaps with what's called a "job") leads to better "job security" for everyone and anyone.
If a government really wanted to tackle unemployment, there's many areas of life that need considerably more workers and resources, including education & health which are pillars of a healthy (pun intended) society. But capitalist policy is to generate misery in order to pit everyone against everyone else so a tiny minority can profit... and in this regard, capitalism works excellently.
> you need something like a cooperative where the users are also the shareholders and you have to buy a membership to use the product
That's how many non-profit organizations operate. You have to be a member (free or < 20€/year) to benefit from services provided by the association.