This is my opinion, everyone likely has their own, some might be very different others may be similar.
I always ask the question before spraying, what are my goals? For example, combat fungal leaf issues. Nearly anyone who grows tomatoes has these issues.
I'd start with the dilute bleach to kill fungal or bacterial spores that are present. Then if you want to alternate id use a fungicide which is preventative. Then alternate and try to prevent issues.
As far as insecticide, unless I have a specific issue I'm trying to attack I wouldn't use it. Why mow down every bug good or bad just to do so? Do you have an insect issue you need to solve?
So that's my opinion, hope it helps.
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