All these people that want to play the game SO BADLY but have to wait for the PS+ edition to make sure they like it, I wonder how they ever decide to purchase every other game that doesn't have trials/demos.
Well your main issue is in assuming everyone still waiting for "wants to play the game SO BADLY".
Different people have different levels of interest in different games. Most gaming enthusiasts either actively or subconsciously place upcoming games in different tiers. There's the "must have this day 1!" tier, which is guaranteed an immediate sale and likely even a preorder, the "Want to play this quite a bit, but can wait/can't play it immediately", which is well within the game's launch window and is bought at full price. Then there's varying levels of "kinda looks neat, but I don't really NEED to play it right now", and they're willing to wait for price drops or several months because they either don't have the time, too busy playing other games, or simply aren't super interested in the game but want to pick it up later. Other people have different criteria for buying a game. Some wait several months until they can pick up a definitive GOTY edition or wait to get it on sale for cheap. Some wait until it costs X amount. $40, $20, what have you. And yes, in some cases, if there's a demo people will just wait for that.
The logical inconsistency of many people in this thread is that they simply assume that either people are being stupid because they really want to play a game and are not buying simply out of principle, or they're stupid because they don't REALLY want to play the game at all and just want to bitch. That's all fine and dandy if they want to convince themselves of an extremely narrow and pretty unlikely narrative, but in reality you're talking about millions of consumers who don't see the need to buy a game day 1, and don't have a yearning to play the game if they don't buy it day 1. Many people are simply waiting because they
can, and for many the milestone is "I'll play the demo to get my hands on it".
This is why saying "just buy it already!!!!" and "you whiners didn't really want to play it and are just being annoying!!!" is just tone deaf. It's completely ignoring how consumers actually react and think in the gaming market. The idea that people wait for a game to hit X pricepoint, or come out with a GOTY compliation, or come out with an extended demo, or simply wait until they have more time to play a particular game or are in the mood to play it is very common and normal behavior. The repeated attempts to make these consumers out to be "haters", "whiners", or any other name one might think of is really bizarre. Sorry, not everyone is as on board on the game as some of you might be and want to wait it out. That is not a reason for all the ridiculous vitriol being spread in this thread. I mean, several posters here have exclaimed they actively WANT the demo to never come out just to spite us. That's well beyond the realm of sensible opinions and straight into childish hate.