Sure, but the technological leaps from Pentium 4 to Core 2 Duo and then to Quad that Intel made in those days over 15 years ago, were massive enough to justify

Sure, but the technological leaps from Pentium 4 to Core 2 Duo and then to Quad that Intel made in those days over 15 years ago, were massive enough to justify the limitation of the same chipset from the Pentium 4 era not supporting the later multi-core Core CPUs, compared to the Ryzen 2-3-4 jumps that AMD made in a similar timeframe which aren't as radically different to each other.