To add to your list: as an early employee, there is a good chance that your equity will get diluted a bit. The small fraction of the company you "own" when you join (and after your options fully vest) might shrink significantly after future funding rounds. As an employee you have little leverage against getting diluted.
The worst statistic of all: the vast majority of employees never exercise their stock options. According to this article, less than 5% of employee stock options are ever exercised: https://medium.com/@henrysward/broken-cap-tables-bbf84574a76... Start-ups would love for you to take a lower than market rate salary in exchange for options as the risk is entirely leveraged to the employee.
If you are going to work for a start-up you should never count your options as payment in lieu of salary. They are a lottery ticket and they are no substitute for cold hard cash. There are various other good reasons one might have for joining a start-up, but options should not be one of those reasons.