I knew that only few mix products. Sticking to the established techniques and products and using products for their intended use will already yield to great results in detailing. However, this is not a poll on whether or not it is ok to mix products. It is obvious that the consensus will recommend buying dedicated products. It is a good advice actually to stick with what the manufacturer says and what has been tested. But, there is always the saying, "to each his own." Thus, product and technique are, at the end, very subjective as far as I observe in detailing forums.
Innovations are often results of experimentation. There are a lot of instances where scientists were called mad at first before they find success, in going outside the box, resorting to something unconventional or going against what is already established. Copernicus took a lot of heat for saying the earth is not the center of the universe. Just like any experiment, there is a risk of errors. On the other hand, there are absolute nutcase. Also, it is my opinion that ingenuity or the ability to perform successful detail with limited is good characteristic for a detailer to have.
I am intrigue by members who take risks. (Unless experiments are taken against clients' vehicles). If a detailer can deviate from the recommended application method and create a method of his own, which is quite usual here, I do not see any reason for trying products for different purpose or even mixing it. Personally, my wallet is not built for buying a lot of detailing products and it will be very beneficial to me financially to mix products that I already have instead of buying additional products. So keep the mixtures coming as I prefer to mix my existing OPII with OPS rather than buying D151, or buy 105 and 205 only without having to buy Menz Power Finish. I won't be judgmental about your mixtures and will never force you to do what works for me. Just remember what Mike Phillips always say.