Was OS/2 a viable alternative for daily DOS and Windows tasks?

It was thus compatible with most protected-mode DOS programs (an early demo involved running Doom in a window), most Windows 3 programs, and even Win32s-compatible 32-bit Windows programs (at least on OS/2 Warp 4). Note that OS/2 does require more resources for basic use than DOS and Windows, so when it first came out, many potential users would have been frustrated if they’d tried it — it really needs at least 8MiB of RAM (which was still unusual in early 1992) and a decent amount of disk space. Some consider that this excellent compatibility contributed to OS/2’s demise: since it was so good at running DOS and Windows programs, there wasn’t much incentive for developers to provide OS/2-specific applications.

Source: retrocomputing.stackexchange.com