Comment by ahartmetz

It's valid, just very error-prone. An advantage of the readiness model of doing I/O over the IOCP/io_uring model is that you keep control over when, where and how much data you read. If you always have to read everything, that advantage is greatly reduced. You still have a little more control and easier memory management. Performance is generally worse vs IOCP - you should at least get some convenience for it!