Sort of. Is the Linux kernel huge and has an amazing number of man years in it .... certainly. If starting over from scratch could you ignore most architectur

Sort of. Is the Linux kernel huge and has an amazing number of man years in it .... certainly. If starting over from scratch could you ignore most architectures, drivers, etc and support current hardware ... also yes. A new OS could skip 32 bit mode, alpha, mips, itanium, loongarch, 68k, pa-risc, powerpc, s390, superH, sparc, parallel ports, serial ports, supporting zillions of PCI/PCIe cards that you can't buy any more, messing around with archaic 16 bit bootloaders, etc.