In addition I always thought the EVAL function was pretty neat. Then there's the inbuilt ARM assembler (two languages for the price of one eh ?), and as assemblers go you can intermix BASIC and ARM assembler in the one program. Then BBC BASIC on the ARM was optimised to make it's subroutines fit into the ARM cache (so as to optimise performance). Sure the improvements are continuing today even - later BBC BASIC's use the assembler CLZ function (ARM v5TE only) to improve floating point normalisation.
BBC BASIC V was designed for the ARM, it's a good and efficient fit, the alternatives may have their strengths - but BBC BASIC has strengths too a point that should not be forgotten.