I’ve witnessed this 1st hand. My entire 1st MF SFT batch was ruined by heating them… and quite a few mixes besides those. Knowing what flavors is adversely affected by heat would require a whole separate batch of test for each flavor.
Imagine trying to troubleshoot a bad mix when heat steeping is involved. At this point in my DIY journey, heating is a procedure in the process that I choose to exclude, as the risk outweighed the benefits for me.
Another no brainer.
DIYing takes patience… and until you learn to exercise patience you will make more errors when mixing. DIYing can be a lot easier with less steps in your process.
No amount of heat will result in good mix. Using accurate flavors that you are familiar with trumps any amount of heating, stirring or steeping. To many mixers concentrate on the wrong aspects when it comes to making a good mix.