Shares are not the means of production. They are a mutually agreed upon fiction and sit firmly within the realm of capitalism.

Leaving aside that market socialism also exists, in which shares do as well, not just Marxist Leninist, what do you define as ownership then? Especially in today's age where value is in software not only hardware. How would a worker own a means of production?

In today's age of exclusive capitalism? There is no worker ownership of the means of production. If you can't use a mine to get some coal, or use some tools to make widget, or use a GPU to do inference I guess, then you don't own it, do you? The point is anyone who needs to do those things can, and that ownership is tangibly available to everyone. Not in the "this is public property" but the state actually owns it sense.

Not at all. They maybe get portion of future valie, but have no decision power and no power at all.

Voting shares exist. In fact, worker cooperatives are the end result by this method, where every worker does indeed have a vote and therefore decision power.

Employees dont get voting shares. These are carefully designed so that there is no risk of employees getting any rights. They are deferred potential compensation.

And no, the companies we talk about dont produce worker cooperatives.

Employees can, if they work at companies that do give them, nothing fundamentally stops them from receiving voting shares.