How important is to have LCD is up to the user's taste. If you have computeror tablet at hand, It's more convenient to get/set datas with it. In my system there is the possibility to connect LCD, but I did not spend time to write code and make it work. The reason, I found way more convenient to do configuration from computer or tablet via simple menu, rather than on a tiny screen, pressing small buttons up&down. In this respect even a 4x20 character LCD is too small to display enough data. To use the five button to adjust parameters is a pain, comparing to type data on keyboard. My menu system could be easily implemented to your project too including parameter storing, 1W device assignment. It would fit to UNO easily.
T.
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