There are quite a few mistakes, and probably wrong impressions.
The 486 had a math coprocessor built into the CPU. Intel did disable it in the 486SX, and then sold a 487DX which was really just a 486 that disabled the 486SX. But, why start with the 486 as the math coprocessor? They were around with the original 8086.
The Pentium was a pile of crap. It was not fondly remembered, it was known as a very hot chip that had an FDIV bug. It was superscalar, sure, but it was very limited in what the "V" pipeline could run, and was not only in-order, but was also-lock stepped. Eventually, they got it so it was OK, but it was never a great chip.
The K6 was never seriously competitive with the Pentium II. It always ran at slower clock speeds, and was much slower at 32-bit apps per clock cycle. In 16-bit apps, it was closer, and was better than the Pentium (not a high standard, but still) except at floating point.
AGP was also a bomb when it came out. No one knew why it was needed, and cards ran no faster than PCI provided the PCI cards had enough memory (which they generally did at that time). It took a while for AGP to really show much benefit. The main benefit was not its access to the processor, which it didn't need very often, but it's access to memory which was much faster, and typically was accessed through the North bridge, leaving less latency.
Windows 3.0 and 3.1 were a big step back for people that used OS/2. They were horrible, and I don't know many people that loved them at all. They both crashed all the time, and didn't even have pre-emptive multitasking. They weren't loved at all.
Cyrix was probably the most hated company in the hardware industry. Again, no one loved this company unless they were deranged. Everyone I knew steered way clear of them, because they always had problems. I did use a weird clock doubled 386 with 256 bytes of cache on a PS/2 Model 80 at work, and it actually did help, but with Cyrix the potential of problems was very, very high.
You left out a lot of very good technologies, and picked ones that were almost universally hated. Not that all your choices were bad. Floppies were very, very good technology, and you'd appreciate that if you ever used a cassette tape. But, the 286 and PC/AT that it was in were very, very loved technologies. NEC Multisync made a big splash. OS/2 was fantastic. The 486 was an amazing chip. The Atari 800 was way ahead of it's time. The Tandy Color Computer line was the first microcomputer to run a pre-emptive operating system. Motorola's 68K was a superb microprocessor with a very nice instruction set. I could go on and on ...