  Companies often expect employees to give advance
  notice of termination of employment, but employers
  do not feel beholden to their employees to
  reciprocate. This is unreasonable.

Workers can leave their jobs with no notice period at all and suffer no legal consequences. The traditional two weeks notice period is a courtesy and not legally required. Meanwhile, employers often have extensive legal limitations on how many workers they can fire at a time (for example, because of the WARN act). It may be impossible to fire some workers (for example, those on disability leave). It's traditional for employers to pay severance to employees that are fired or laid off, and this may sometimes be legally required.

Nobody can force a worker to work, but an employer is often forced to employ someone they'd rather not. Maybe sometimes this makes sense, but it's actually the exact opposite of what you're trying to claim.

  Many companies showed improved productivity when
  people were given flexibility. Claims to the contrary
  are often not backed up by actual data outside of
  cherry-picked results chosen by those in managerial
  positions.

If remove work is so productive, then management should choose remote work without any coercion. If you want more benefits, then just be honest and don't make claims that you know better than management about what is productive.

  MTG is a creative endeavor, and its output is
  protected by copyright. Copyright is, so far
  (thankfully), only enforceable when the media
  is produced by humans. Protections against the
  use of generative AI are not only good for 
  workers' long-term productivity, but also 
  for legal purposes

Copyright applies to works that are partially produced by AI and partially produced by humans. Refusing to use the tools that everyone else is using to be more productive is just going to make companies into dinosaurs.

  I think maybe you should stop licking boots and
  start understanding why any of our society works
  today at all.

The union is also a corporation, which makes profit for its officers. Maybe you should stop licking its boots?

  As a hint, every protection you have
  ever enjoyed (40-hour work weeks, pensions or retirement
  funds, health insurance guarantees, mandatory paid time
  off, health and safety regulations, and so on) was paid
  for in blood by someone a company decided was not more
  important than profit. Unions are a fundamental  capability
  by workers to ensure their own safety. Shockingly, I think
  it more reasonable to rely on the interpretations of those
  working in these jobs who want to unionize than some random
  person online who thinks "no wait, but think of the poor
  endangered company! :("

I'm not a member of any union. The protections I enjoy are because of the law, which applies to everyone, and because of the economic situation. If the economic situation changes, I will be fired no matter what unions or governments do, the same way saddle-makers were after the rise of the automobile.

United Wizards of the Coast