Not an excuse to quit bathing entirely. But there has been at times an obsession with eliminating all surface bacteria to the point where the immune system is ineffective. Exceptions of course is wound cleansing, someone performing certain medical procedures, working in food prep, etc.
There are certain levels where there is a symbiotic relationship with bacteria, the best known is in the digestive tract.
When all is said and done, whatever schedule of showers works best for you is good as long as you’re presentable, healthy and hygienic.
Some people may need a shower daily. Others may be okay with longer intervals.
Swimming in salt water seems to be a natural activity.