The UI is dated, and increasingly falling behind any modern standard. At times, when there are options to choose from, the documentation fails to provide recommendations. Since this is a tool for non-professionals, adding recommendations is really needed. There are also basic usability issues. For instance, in the 197 form, where you add assets. If all assets from last year were already deprecated in full (which is a common case), why show them at all? and if you already added them, why not have a Delete All button?
The support is amazing. I could not find my return and Gloria, who is very helpful, knowledgeable and patient, helped me step by step. I could not have done this without her.