While you can argue that SAFEs are roughly equivalent to equity (with the advantage of allowing rolling closes) they are very bad for startup employees. Many startup employees have no idea how much they really own of a company because their equity disclosures do not include the conversion of the SAFEs upon future equity rounds.

I have met many companies where the first few employees think they own 1% of the company, and after a Series A where 25% is sold they find out they only own 0.5% because the SAFE conversions took up another 25%.

In some cases founders don't understand what is happening or how to include SAFEs in their cap table, in other cases they are purposefully obscuring the cap table. Whatever the reason it's very bad.