61 can be limiting for piano. Also, if you like to use splits, you can end up with a pretty restricted key span for the individual parts. For example, playing LH bass will generally limit your RH sound to 37 keys or less. Even if you don't care about having the full 88, it can be very helpful to at least have 73. Though if you rarely split and aren't overly piano-focussed, 61 obviously can still work well.What is this romantic attachment to 88-keys ? ..... for most of my life (except when I was learning music formally as a child on a genuine piano) I have played on 61 keys...... starting with a Yamaha YC-20 combo organ in 1975 in my first band..... and never found it a limitation.