I agree with you - if it works for you, then great. However, too often it's stated as a fact that ponds need salt, when in fact that's not true. Too many people are keeping healthy, happy fish (not sure how you determine fish happiness, but we'll assume healthy=happy) without ever adding salt to their ponds for that to be an accepted fact. Again, I won't argue with your desire to keep doing what you've always done; I just think it makes for a more balanced conversation when others who read this can see that there's more than one way to keep a pond.
A little food for thought - some more current pond think has suggested that constant salt in the pond can be like over-use of antibiotics in humans or animals. When you really need it, it won't work, and in fact may make you more susceptible, not less.
Here's one example of that thought process:
Salt definitely has it's time and place in koi keeping. It can be very useful in treating stressed, sick and new koi and it can also be great at controlling parasites. However it is NOT a good idea to leave salt in your koi pond all year long. There are no real health concerns from long term salt use in a koi pond, but the problem occurs with parasites. If salt is used year round, parasites can build up a resistance to salt and you end up with these super bugs. Then you will have a much harder time later trying to kill off parasites and even more drastic measures have to be taken. Such drastic measures can often times be dangerous to the koi. So use salt sparingly and remove the salt with water changes once you are done.
I lifted that from a koi suppliers webpage, but I've seen it repeated lots of places.
Ah! From what I've read on this site, quick fluctuations in Ph are not so good. So I see the concern.
But to be clear, adding salt will not do anything to correct that, if in fact it happens. We've had some conversation about that topic here, too. Let me see if I can find that thread.
@Amber Pickle is saying the parasites flourish in the higher pH - I'm still wondering why a pond that is constantly salted would even have parasites in the first place.
Again - just a conversation. Nothing personal toward anyone's style of pond keeping.