It seems like the core things that Anki needs are new user experience improvements, and algorithm updates. SM2 really shows its age as compared to other algorithms.
For me really learning a word means:
(1) Knowing how to say it.
(2) Knowing how to write it, meaning the Chinese characters, of course.
(3) Still remembering (1) and (2) after at least a month.
(4) Being able to actually use the word correctly.
Do you really learn 20 words properly under those definitions? If so, then respect. I consider myself to have quite a good memory for visual information, but if I don't try to memorize 20 words as a full-time activity on that day, and write them hundreds of times, I am fairly sure they won't stick for long, maybe not even until the next day. Some obviously will, and some have good explanations why the characters look as they do, but others don't, and feel arbitrarily constructed.