What are some common low MMR myths, half-truths and bad habits?

Examples:

• "we need tank" .."bristle"
• "AM will win late game"
• Picking axe for dazzle
• Carry and his support staying in dangerous lane past 10 minutes
• Using glyph for T2 when enemy is going to take it anyway
• Defending sidelane T2 when outnumbered
• Attacking mid T2 without Roshan or numbers advantage. Throwing the lead
• Ogre Midas which has low winrate
• Dewarding the sentry and re-warding same area
• "You haven't played in SEA yet"
• Not farming aggressively
• Delaying bkb or never getting it.

I know some of these "bad Dota plays" are actually rewarded in these mmrs. Clinkz for example only has a good winrate in these mmrs.