I thought you were done explaining your definitions...of empirically supported opinions...saying mass is something that it is not is wrong. Mass units cannot be the same as that something else...
Your language seems to be so twisted up in identities that is it difficult to make any sense out of what you say. Of course, saying mass is something that it is not is wrong by definition. That is what those words mean and so you do not have to keep repeating them.
You have something that you call pure observation and space and time can be observer, but then you state that neither space nor time are subject to direct experimentation. So direct experimentation is somehow different from pure observation in your mind, but not in any one else's mind. Making these kinds of distinctions in word definitions seems to reveal hidden truths to you but just seem like redefining words in confusing ways.
Wondering why the universe is the way that it is or why force is the way that it is or why identity recursions exist are questions that result in perpetual discourse. There are questions that have no answers and there are definitions that make no sense and there is a pure observation that is not a direct experimentation.
Strangely enough, you do have a method in your madness in that you keep repeating that identities are not definitions. I use the term axiom, but you do not like that term. You choose to begin your universe with force and acceleration and there are many different equivalent axioms upon which to build a universe. Somehow you have convinced yourself that building a universe from force and acceleration reveals some kind of hidden truth. To me, it seems like just another way to build a universe.