Antipatterns I’ve experienced or watched when building businesses

I've seen and often fallen into all of these. For some reason its easier to recognize them than to avoid them.

• Building ahead of validation / too soon
• Pitching your preferred solution before understanding the problem
• Asking users leading questions ("would you use X?")
• Chasing edge-cases – solving for one vocal user instead of the core pain
• Building in isolation without feedback
• Premature optimization
• Prioritizing core or 'table stakes' features before creating differentiation
• Feature creep
• Holding back launching for some 'big release' that never happens
• Too shy to share your ideas before they're fully baked
• Staying in 'stealth' too long
• Building all the features your users ask for instead of designing around their needs
• Spending your time on trivial decisions
• Over-engineering infra – optimizing for scale before product-market fit
• Starting too broad-  trying to serve “anyone with this problem.”
• Not articulating the user’s alternative – forgetting what you’re replacing
• Hiring friends instead of complements
• Ignoring distribution early – assuming good product = automatic users.
• Constant idea-switching – abandoning progress before compounding insight

What're the most common anti-patterns you've seen when building businesses?