I won't admit it Chas, because I really didn't have any training on piano. I've found that some trained pianists have a lot of trouble playing arrangers in the basic modes, because they have trouble retraining their left hands to ONLY play chords.
Of course the full keyboard chord mode might work for them, but it's still foreign to what they are accustomed to doing.
I think the most important factor in arranger playing is learning music theory and the relationship between chords.
But I'm old and growing much more stupider every day. See, even using bad grammar.
Having said all this, I strongly agree that if you want to learn to play piano, whether you are young or old, you must have a piano, not an unweighted keyboard.