If the dividends are so low that you will never be reasonably paid back you can often negotiate to get out in some form. Very low cash flow only with no growth seems to be the only exception...which I'd guess would only exist if something such as high revenue or some unique IP existed to make the equity very valuable and therefore the company worth running.
With a convertible note as opposed to a SAFE, you either need to extend the maturity date or get paid back your note with interest.
Both SAFEs and convertible notes seems to have a path to exit in some reasonable form.
The only time I've seen "nightmare" situations occur is when the investor themselves makes it a nightmare i.e. https://www.cnbc.com/2025/01/07/tech-investor-denis-grosz-or...
...and that's a nightmare for the company, not the investor.