I am new to this forum, so I might ignore someone's response or repeat them because I don't have time to read all of these. I will state my own opinion on the topic.
So...I believe worker-owned companies aren't good ideas. Fellow posters, prove me wrong but please don't utilize traits that will result in a report and ban.
Reason1: Workers already have tiring jobs, and they should not also manage new things.
The average work hour is 9 am-5 pm, which is 8 hours of somewhat-repetitive works. Minus the lunch of maybe 30 minutes, there are still 7 and two-quarters of time to spare for these mundane industries. Most workers just want to earn money, and somewhere there are offices of bored people who, in which none of these ordinary human beings wanted to work here. Now, since the entity is worker-do, worker-own, worker-manage, there will be hardly any time for them to do managerial jobs also. Yeah, you are the worker who packs paper(or scientific equipment, whatever) every single day, PLUS co-manager, PLUS regional salesman. How tiring is that? With this pressure on their gardening hoe, many people would want to quit. There will be a situation in which there are no managers, and a new one is elected(and surprisingly, no one would want to do the job because they are already workers), and then they retire, and then repeat, repeat, repeat, repeat, repeat, repeat until the company has hardly people anymore, and every single person there has a LOT more work than usual, resulting in them quitting also, and running the company down to ruins.
Reason 2: Unfairness.
Explained in the last one, well sorta. The present state of humanity, especially many in depression and paranoid due to the mundane works they had had to do, would make worker-owned companies unfair. Say, the lowest tier of worker will think, "Why does Jim have the privilege of being a co-manager, while I can only do this?" When he is the manager, he will think, "Why does Michael only have to flip nuts n' bolts, while I have to manage all sales in the West New Mexico?" Same categories, different jobs, jealousy appears. Until one point, where a worker is good enough that everyone wants him to be the boss, the government wants him too. Then, it is no worker-owned business no more.
I'd also like to mention the anarchy this would cause. If one worker slacks off then he may influence most of the room. Good king is good, bad king is bad, no king is bad too, indeed. If there is no "boss", then everyone would slack off at one point unless everyone is extremely disciplined. Anarchy would also run the company down to the grave.