I’ve found that as you do more work at or around threshold for extended periods, you become a better judge of what it feels like … which in turn helps you pace long efforts better (including longer form FTP tests). That need to ‘learn’ the feel is the main drawback compared to the ramp test, whose main benefit is supposed to be that it doesn’t need any experience of pacing.
There are threads like this with extensive discussion on ramp test vs 8 minute vs 20 minute vs other test formats: