Not exactly. We can in fact build each other with our testimonies, to a point. And under certain conditions. One of those conditions would be, to me, that the fruit of the testimony is Biblical Christianity, therein lies the problem. If the testimony produces something unbiblical it does not edify, naturally.
I believe that as God intends for us to unified in both knowledge and faith, I think this refers to that we all hold to the same teachings, and that we all believe in the same ways, and in this unity, there would be no argument over doctrine or experience. Unity of faith in my understanding is that we have a like precious faith as with each other, and with the Apostles, and if that is so, there won't be any concern. We'll recognize the Spirit in each other, and we'll all teach the same things.
But an over-emphasis on the experiential and in particular when there is doctrinal division, I think the doctrines need to be settled first before we start trying so sort out with each other our internal and subjective understandings of things we've experienced.
Clear as mud again I expect! But hopefully this helps share my thoughts. And I appreciate your discussion!
Much love!