If you have sensitive skin (sometimes you dont even need to), switching products can have a negative effect. I did acquire SCAD and SSAD but I realized that some creams/soaps are better than others. Some offer more lubricity, moisturizing, some are thicker/slicker. This variable changes your technique, whether an M3 or a straight razor.
I personally have noticed irritation from switching products. Part of it being the product itself (using different stuff on your face all the time is asking for some kind of irritation anyway) and the other part is the fact that I mentioned some creams being less slicker or less lubricating than others, and while you shave with the same technique, might cause more razor burn or having to go over the same part with too many passes. I myself like proraso red and TABAC but have noticed that the technique with either can change as well. Musgo is thick and offers a false sense of security IMO because I find myself having to go over the same spot more often, in contrast with something like TABAC. So, before you think about switching between all these products (which is fun and offers variance), sometimes its better to stick to one tried and true product so that your technique and other variables are always aligned together and your irritation is kept in check.
I personally have noticed irritation from switching products. Part of it being the product itself (using different stuff on your face all the time is asking for some kind of irritation anyway) and the other part is the fact that I mentioned some creams being less slicker or less lubricating than others, and while you shave with the same technique, might cause more razor burn or having to go over the same part with too many passes. I myself like proraso red and TABAC but have noticed that the technique with either can change as well. Musgo is thick and offers a false sense of security IMO because I find myself having to go over the same spot more often, in contrast with something like TABAC. So, before you think about switching between all these products (which is fun and offers variance), sometimes its better to stick to one tried and true product so that your technique and other variables are always aligned together and your irritation is kept in check.