Couldn't agree more.
Let consider just rain. Rain can increases dissolved oxygen, change the water turbidity, change the water temperature, increase the current, raise the water level, etc.
How fish react to changes in their environment depends on a countless number of factors. To condense the secondary effects that weather potentially has on a fishery into concrete rules that an angler can use to catch more fish is impossible in my opinion. That said I'm sure there are plenty of people that think they have figured it out and would love to share their thoughts with you.
You may be able to find local patterns that are repeatable when conditions are similar. Don't overestimate how repeatable these patterns are on other fisheries or at different times of the year.