How do we balance against an orthodoxy setting in? As a startup employee, it was unusual and impossible to ask for ISO options until recently. It's changing now. Why shouldn't there be terms in the agreement that felt perfectly reasonable a few years ago but seems unfair to the founder now?
A standard form should be a guidance. It shouldn't become an unquestionable text.
YC released the SAFE and then a few years later, after working with thousands of founders, thought it was too confusing to have a feel for ownership and conversion with pre-money valuation caps, so they moved to a post-money SAFE.
The SAFE itself has a few variations and you’re welcome to add/remove things as they make sense. With more complicated legal documents, like a Series A raise, of course people should adapt.
A standard form should be a guidance. It shouldn't become an unquestionable text.