Not only does this premise commit the personal incredulity fallacy, it also explicitly ties the immaterial quality of creativity to material ownership.
The latter needs justification, which may well be attainable, but just because you or any reader has never heard of a socialist factory or socialist-anything-creative - doesn’t mean they haven’t ever existed or could exist.
If there were some reason for creativity to necessarily only arise through personal ownership of the means to realise one’s creativity, then the incredulity fallacy could be averted since it would objectively be the case and not just be down to personal experience. Not physically creating something is not a reliable indicator of the potential to create given the means to do so.
Is it possible to have a realistic idea and lack the means to realise it?
Is it possible to realise a creative idea using property claimed by others?
In both cases the answer should clearly be “yes”.
It’s also perfectly possible to own property and to never personally have a creative impulse whatsoever about its usage.
This means that creativity is completely independent of economic structure and ownership ideology.
Ergo, socialist or capitalist creativity is no more valid an association than apple creativity or speeding creativity.
40 hours a week to come up with a product or 168 can be as true as you claim, yet it’s a question of motivation and possibility. Who wants to be creative and who can? Can someone who doesn’t own their means of production create and will someone who does own their means of production necessarily create? Will one create more than another?
You need to address creativity in itself long before you address the psychology of motivation, and this long before you think about generalised economic necessities for fostering said motivations.
Perhaps you already have, but you completely neglected to go through a thorough and comprehensive methodology for arriving at such a conclusion anywhere ever on this board.
Ambition and fairness - sure, discuss.
Your willingness to jump to conclusions assuming all the groundwork, at least without reference to every single logical step along the way, presents more yourself as religious - delivering “revealed truth” - long before any accusations of religiosity in others could ever hit home.
Overcome the hypocrite in yourself before you accuse it in others. Pain be damned.