No be compulsory to read a post from beginning to di end, sometimes from di title you go easily deduce wetin di topic dey talk about and sometimes wen you read first few lines you go also know wia di poster dey go. Personally, I no dey like lengthy posts except na topic we interest me or na subject wey I wan gain knowledge. Just as Brainboss talk no be quantity na im really mata, na quality. Wia dose lengthy posts dey bad pass na if di person no be native English speaker or di person just put some incoherent thoughts with disjuncted grammar into writing. A well structured, concise and to the point posts or reply go do di work for you instead of all dose talk talk or repetitions wey no really mata.
E dea very important to read from begining to end before replying.
Sometimes waitn dea headline dea talk about dea differently entirely from the content itself. You fit call this aspect of write up as a "Mismatch" kind of write up. The writer go use something captivating to catch our attention meanwhile, waitn im dea try express dea different from the headline. In this scenario, if we no take our time to go through the content, how we one talk know waitn the writer dea try talk?
Even for exams, I believe say them dea always tell us to go through the questions before answering them. Also, when we read before replying, it's show say we respect the time and effort way the writer give to come up with the content and e dea also make communication dea much better cox we don get a clear understanding of what the writer dea talk about.