If history had taught us anything in computing it’s that breaking backwards compatibility/rewriting it isn’t the panacea. See Perl, python, C++, longhorn, mosaic for example. My 4k, 120hz monitor with 32 bit color depth and 16 4.5GHz cpu cores attached to it still renders a terminal at 80 characters wide and chokes on cat bigfile.bin because we’re that married to not changing things.