You usually do not know if a chick genuinely " likes" you or not for at least 6 months to a year imo,( I am an LTR guy) you can't tell if she likes you just because she responds to a text message within a certain amount of time or not or just because she meets up with you or not.Of course you do not want to be chained to a chick that doesn't like you that is just my point...but I know you are NOT an LTR guy anyway so in your case the point is probably moot.Women wear so many masks and are manipulative for many reasons that you may have to do thorough investigative work before you know for sure if she likes you or not.Many men are blindsided when women just "quit" them in LTR's and are shocked,when the real reason was they just didn't like them,remember women do NOT think like us and are not as rational as your first post implies.
Well I really don't care if a chick gets back with me on texting because I really don't do that. If I ask a question and she doesn't respond, I assume she is busy. So I agree texting really doesn't mean anything. Unless you are trying to coordinate a date... the fact that she is bvllsh!ting around with making plans is more relevant than tap dancing around texting. If she isn't making things easy, she isn't interested.
But really... you just have to trust your gut. It doesn't matter if you are looking for a LTR leash to put around your neck, or just want to spend some time with women and have fun... until it isn't fun anymore, figuring out if a chick likes you is all the same.
You can always tell if a woman is interested, what you DON'T know is what it is she is interested in. Is it you, romantically, or is it something she thinks you can do for her. Chicks will flirt with you, and even go on dates with you, if they want something from you, and the only way to know for sure what she really wants is if you escalate... then and only then will you know for sure.