I'm interested to hear from anyone who has paid down the investment mortgage loan and now owns the property free and clear.
And if it made a big difference to your life
I think the issue you've run into relates to the type of poster you'll find on AAM.
As you've probably noticed from the replies, a lot of posters here aim to maximise wealth so would champion a different approach to what you are proposing.
As it's unlikely you'll find many people who can relate to your approach perhaps a different online forum would better suit your query. Of course the problem there is it's always possible non-AAM forums may have posters who are equally focused on wealth maximisation.