I have been working with glass and tiles for nearly 30 years and mosaicing for the last 15. Over the years I have experimented with many different techniques but have always used glass cutters to cut tiles. I am self taught so I have never learned what one could or could not do, I simply experimented and sometimes this has led to interesting advances in technique.
The reason that some mosaics are ungrouted and are actually not even adhered, is one of practicality. They simply take up too much room. Storing them loose is much more efficient.
I find mosaicing a continual learning process and I learn from every mosaic I make and improve as well, I hope. If I recreate a mosaic a second time it is always an improvement on the first attempt. One can see by looking at Nude # 1 how making a couple of sketches, if that term can be applied to mosaic, can help develop a theme.
I have colleagues all over the world making beautiful mosaics in many different styles, using glass, stone, ceramics and many other diverse materials. One thing they mostly have in common is using many small pieces, another is that they generally use the same tool kit.
I prefer to use larger pieces in my work. This combination of being self taught, using a different tool kit and large pieces tends to give my mosaics a definite style of their own as well as giving me the ability to mosaic large areas relatively quickly.
I personally find mosaic very tactile, I love the feel of them under my hands. For this reason I like my mosaics to be totally flat with the only rounded edges used on the edges of the mosaic.
Not all tile are equal when it comes to cutting them. Through experience I have found Pavigres, Villeroy&Boch, Mosa and Buchtal to be among the very best.