People complained about "Wintel" because the 32-bit x86 chips were so fast and cheap they destroyed the market for RISC designs and killed existing RISC workstation and server architectures, like SPARC and HPPA and MIPS.
By the time the Pentium came around, the future looked like a completely monotonous stretch of Windows NT on x86 for ever and ever, amen. No serious hardware competition, other than Intel being smart enough to not kill AMD outright for fear of antitrust litigation, and no software competition on the desktop, with OSS OSes being barely usable then (due to an infinite backlog of shitty hardware like Winmodems and consumer-grade printers) and Apple in a permanent funk.
We were perpetually a bit afraid that Microsoft/Intel would pull something like Palladium/Trustworthy Computing [1] and lock down PC hardware but good, finally killing the Rebel Alliance of Linux/BSD, but somehow the hammer never quite fell. It did in the cell phone world, though, albeit in an inconsistent fashion.
[1] https://en.wikipedia.org/wiki/Next-Generation_Secure_Computi...
Microsoft and Intel really seemed permanent back then. I wonder if that's how people felt about IBM back in the 1950s.