I do research but not as extensively as you but it's not because I'm one of those guys who thinks "they're just fish". It's because I started the hobby young way before knowing any better and have learned a lot through trial and error as well as research and experience since. Once you have the basics of fish husbandry down there's less involved in researching in my opinion. Much like after owning a dog you have the basics down and only need research the breed your interested in owning next time, so you can make arrangements for any special needs they might have. Such as Whippets and their susceptibility to the cold, the general personality of the breed, etc.
Another reason for my lack of research time is because most of the fish I am interested in the information on is scarce, so when I do research I find I run out of info. available quite quickly. Even on fish that are well known the information can be lacking or contradictory so it always has to be taken with a grain of salt. Interestingly one of the most important aspects of fishkeeping in my opinion is often ignored in fish profiles, namely what strata of the water the fish are likely to inhabit. This plays a big role when considering aggression, predation, interaction between fish and even tank size; and can vary greatly even within the same family or even genus. Still I do the best I can and often ask others who've had personal experience on here, which is often times better then some of the profiles which just re-hash the same info. over and over again. After that I actually do take the time to list the fish I'm interested in the filtration system and what ornaments I should add and weigh the pros and cons of each before making a decision as well as asking myself what I really want. Do I want something that is just rare/unusual, do I want something I can breed, do I want something aggressive or a community, if a community do I want it to be a colorful display or one of predators. Sometimes it's tedious but I've found I enjoy the hobby more and stick with my stock choices better doing it this way.