Why? Because Macs are THE most user-friendly personal computer to operate, period - you just point and click.
Macs do not need to be built that way you described since they are already equipped with the best graphics, video and sound cards available. You can always accelerate or enhance them, I guess, but nowadays they are so fast, there is little to no need.
Setting up a Mac is simple and takes only a few minutes... you just plug it in and the guide gives you all the options as you choose which options you prefer.
Macs rarely get viruses and unlike a PC, the hardware cannot become inoperable from any virus as the software and hardware are run separately, unlike the PC.
Windows usues MS DOS (the most insecure, pourous OS ever created) as its foundation and visually EMULATES Mac OS, therfore it is fundamentally flawed at its roots or foundation, thus all the continual security patches and updates as well as software, email viruses, etc.
Macs are cross-platform machines with the ability to run both Windows and Mac OS and the new Intel-inside dual processor Macs have true multi-platform/multi-operational capability. Windows can only dream of that. The Mac has always been superior in graphics, desktop publishing and video production while the PC's biggest claim to fame was selling clones and software availability/compatibility. With the new Intel chips, that makes that claim irrelevant.
Windows' hardware "open architecture" is its biggest weakness... and makes it prone to sabotage - a Mac's hardware can only be sabotaged bi opening the case and tinkering inside.
Oh... and Macs RARELY freeze or crash... maybe once a month or less if that, unlike Windows which does daily, if not hourly.
That is why.