Hexadecimal: How does FF = 255?

it is just the convenience of having bytes within 2 symbols, remember how small computer screens used to be

You make it sound like relic of the old age. To me, the advantage of hex is that is goes so well with four. So you can play from a rhythmical offset (slice/Sxx command), all with easily typed numbers like 10,20,30,40 (instead of 16,32,48,64)…hex is easier and faster for these time based things…