So you're saying that your ability to get work done is dependent on forcing time with your co-workers on your schedule instead of theirs? This would be rude even if in the office. I've had the complete opposite experience of being able to get co-workers to respond in chat and jump onto meetings when needed.

I can definitely agree that if your company doesn't set an expectation of how remote/hybrid work will be conducted then there will always be some people who are overly laissez-faire with it. My own opinion is that remote work should be conducted mostly the same as if you were in the office. You're just not sitting in the same building anymore. Everyone should keep sensible hours that are close to the same hours of your team and be generally available. Seems to have worked so well for my company that they've begun closing down physical offices.