Checklist makes sense for practice
Checklist are made for practice and improving your game but counterproductive while playing. Someone gives you a good pointer and you may want to add it to your practice checklist. Sometimes I will take notes when watching a putting instructional video, then add the notes to a practice checklist to see what works for me. Everyone has an area of the game they want to improve.
However, game day checklist are at a higher level. Feldberg suggests some putting practice and then if possible play a fairway or two to warm up. You want to putt and play with confidence so throw out any "proper form" checklist and go with the best form you currently have.
Most folks have a pre-putt routine. But once more that is something they developed in practice to drive accuracy and consistency.
Guess the main pre-throw checklist, before grabbing a disc out of your bag, is to determine which type of throw is best. If I am not careful will go to sleep and do my automatic normal throw without checking out all my options and consciously deciding which type of throw would be best.