Rendering instruments to audio early in the process forces completion by removing the option to keep editing the source
The infinite recall of software DAWs — every parameter resettable at any moment — is also a source of endless distraction: there is always something that could be tweaked. Rendering to audio and removing the source instruments eliminates this option, forcing progression to arrangement and mix. The constraint is an arbitrary one (cf. Arbitrary Constraints) but with a specific psychological purpose: closing doors so the only direction is forward. Secondary benefits: reduced CPU load (audio is cheaper to play than virtual instruments), improved project portability for collaboration (no shared plug-ins required), and the possibility of using different DAWs for different production stages.
Examples
At the end of sound design: render all synth tracks to audio (with effects printed), delete the synth instruments from the project. Now only audio exists. The inability to tweak synth parameters forces commitment to the arrangement.
Assessment
In a current project, render all melodic and harmonic elements to audio. Remove source instruments. Work on the arrangement for one session using only the audio. Report whether the inability to tweak helped or hindered finishing.