If TRs data analysis model is based on people not throwing in a massive finishing sprint and you're wanting to use TR to train then it seems pretty silly to counter their advice just for dickswinging watts on your FTP.
This is an interesting article on a few different options though:
I guess because of the pacing aspect, rather than physical aspect.
The 20min testing protocol is harder I feel (which is probably why I moved to Ramp tests and never went back).
If TRs data analysis model is based on people not throwing in a massive finishing sprint and you're wanting to use TR to train then it seems pretty silly to counter their advice just for dickswinging watts on your FTP.
This is an interesting article on a few different options though:
https://www.cyclingweekly.com/fitness/i-tried-5-alternatives-to-the-old-20-minute-ftp-test-and-i-wont-be-going-back