Obviously a question like "where can I buy X" is not on topic, but there is a valid question right now of chinese-brand vs established-brand HTs. This is more of a continuum than an easy boundary line, so where should the line be drawn? Some examples:
Requests for specific product suggestions or comparisons (What model is better for my purpose, a Yaesu VX-7R or VX-8R? / Suggest a good radio for portable APRS use.)
Requests for products fitting certain criteria (What radios can be used for portable APRS use? / Does the Wouxun UV-3R fit these requirements?)
Questions of how to find a product meeting certain criteria (What features or parameters are required for portable APRS use?)
Requests for a brand or product meeting an objective threshold (What brand of ham DMR radio is most compatible with MOTOTRBO features? / What company produces UHF portables with the best adjacent channel rejection?)
Or put in other words - product suggestions? product comparisons? Objective questions about whether a product fulfills a certain need? General questions about how to evaluate products? General questions about what brands tend to meet certain criteria?