This is not true. I'll give a detailed description, do the extra listing for extra pics thing and people still ask the obvious (meaning everything is stated in the listing). It seems like the majority on Posh do not know how to read or chooses not to. I'll even cap the NO TRADES/PAYPAL at the very end of my listings (you really can't miss it) but then a thousand "trade dear?" comments will still roll in.
True, people do not read. It is absolutely frustrating. I remembering selling a bag to someone (not on poshmark but somewhere else) and she asked the same exact questions that could've been answered In my listing. Not to mention she was rude. I am usually patient and like to answer questions, but she was the worst buyer ever, I couldn't wait to sell her the bag and just be done with her. I posted pics but the website I used wouldn't upload clear photos of the bag I had listed.
However, I wish poshmark would allow more pictures in one listing instead of us having to list several different listings for one same item. Lots of people won't read that there are other pics provided in a different listing because they are lazy. I know it won't significantly deter the buyers who constantly ask to trade or use PayPal, but at least having more pics in one listing would make it more convenient for everyone and weed out buyers who are looking for a specific condition and style. I sure as heck would not want to deal with someone overly picky like the person I just described.
I don't even bother buying on poshmark because the platform is terrible and I hate it. Many pictures are awful, lots of fakes, and many of the people selling are just as lazy as the many people who buy (not all, of course, but a lot). I only use it because it is so easy to sell stuff. After I complete this sale I just did, I am going to delete my account and stick to tradesy, local sales, or consignment.