Putting aside the most unfortunate observation (cf the book 'Queer Episodes in Music') that Clara was not a particularly warm or kind individual, I suspect that her piano playing in middle and later years was not anything compared with the many great pianists active at the time, certainly nothing to match the the volcanic Teresa Carreño.
I fully recognize (perhaps unfairly) that Clara is a difficult issue for me.
Let's not forget she had quite a bit of a rollercoaster of a life, where both her husband and one of her children died in mental asylums and several of the remaining children died long before she did. Correct me if I'm wrong, but I believe she both was touring while late in pregnancy, and I also have a faint memory of that one of her children died during one of the tours, but she decided to continue the tour. Not because she didn't have a heart, but because she singlehandedly had to take care of a large family, and she did not accept money from anyone. She took care of her grandchildren as well, once one of her own kids wasn't able anymore to raise them. So yeah, it might be a tiny bit unfair to just toss her off as a not-too-warm or kind individual. More info, through wikipedia:
"Clara Schumann was the main breadwinner for her family through giving concerts and teaching, and she did most of the work of organizing her own concert tours. She refused to accept charity when a group of musicians offered to put on a benefit concert for her. In addition to raising her own large family, when one of her children became incapacitated, she took on responsibility for raising her grandchildren. During the May Uprising in Dresden in 1849, she famously walked into the city through the front lines, defying a pack of armed men who confronted her, rescued her children, then walked back out of the city through the dangerous areas again.
Her family life was punctuated by tragedy. Four of her eight children and her husband died before she did, and her husband and one of her sons ended their lives in insane asylums. Her first son Emil died in 1847, aged only one. Her husband Robert had a mental collapse, attempted suicide in 1854, and was committed to an insane asylum for the last two years of his life. In 1872 her daughter Julie died, leaving two small children. In 1879, her son Felix, aged 25, died. Her son Ludwig suffered from mental illness, like his father, and, in her words, had to be "buried alive" in an institution. Her son Ferdinand died at the age of 43 and she was required to raise his children. She herself became deaf in later life and she often needed a wheelchair."
In any case, we can leave the disciples of the Schumann/Brahms circle for a later discussion. De Lara might have little of interest for us, but I maintain that some of the other pianists like Friedheim, Ilona Eibenschutz and Fanny Davies do offer insights into the music. Don't miss Ilona's talks about her memories of Brahms...
...but for now, let's stick to the Liszt circle perhaps!