Most questions are based on a need for knowledge about what parts to use or curiosity. The latter do not make suitable questions for SE sites and will normally be closed.
For the former, fortunately the bicycle industry is fairly standardized (even if there are many and evolving standards), so knowledge of the bike make/model/manufacturer is rarely helpful in determining any maintenance issues and parts requirements. Ultimately the industry is dominated by a few parts manufacturers and a very large number of "Bike manufacturers", who largely build a frame to the standards of the day and attach components.
In most cases, a better question that will lead to more practical answers for the community should revolve around the specific problem that needs to be addressed. Photos of areas of a problem are almost always all that is needed to identify what components and work is required. In rare cases its helps to know the bike manufacturer and model as some parts are very specific (e.g. Bottom bracket widths)
In cases of vintage bikes and none traditional bikes, knowing the bike manufacturer/make/model and year can help track down old and obsolete parts, and the real problem is solved by knowing this information. These are valid "Identify my bike" questions.