No one but him can answer that comprehensively, because he's the one that knows exactly what design elements in Primal stem from his decisions, etc.

But these 2 recent threads might help give you some more context

nostr:nevent1qvzqqqqqqypzqamkcvk5k8g730e2j6atadp6mxk7z4aaxc7cnwrlkclx79z4tzygqyvhwumn8ghj7urjv4kkjatd9ec8y6tdv9kzumn9wshsz9mhwden5te0wfjkccte9ec8y6tdv9kzumn9wshsqg9jg2kcdvp4d82xf42c3uz5dhurpzf2xz52f0duv5lkwcn3h263pcdqn08r

nostr:nevent1qvzqqqqqqypzqamkcvk5k8g730e2j6atadp6mxk7z4aaxc7cnwrlkclx79z4tzygqy88wumn8ghj7mn0wvhxcmmv9uq3jamnwvaz7tmswfjk66t4d5h8qunfd4skctnwv46z7qpqwmhpqaalg6kj6znc5fq02z96jx9kpcfynk56shrd6nuqtd6km29sauxl3q