I advocate viewing the owners manual as a recommendation knowing that certain circumstances do require deviating from it. This includes earlier or extended services depending on the products used and service conditions. When I was a tech I was 100% honest with my customers and never pressured them. If they asked I told them the truth. Needless to say I was requested often in a large 40 bay dealer.If what you are advocating for here is changing fluids earlier than a manufacturer’s interval, isn’t that the opposite of extending a maintenance item well beyond the manufacturer’s interval?
The former is "over maintaining" (for lack of a better term) according to a maintenance schedule, while the latter is disregarding and/or neglecting the maintenance schedule.
By all means, change your fluids earlier and more often than the manufacturer recommends. Do it as often as you want. That’s between you and your wallet.