All of the above – inconsistent application of rules makes it a stressful experience. If you’re lucky it will be a cheap, no-frills flight to roughly where you wanted to go.
Personally, I have only ever caught them when there was absolutely no other option, and I hated every second of it. I hated sweeping crumbs off my seat before I could sit down, I hated the constant up-selling throughout the flight, and I really disliked how uncomfortable it was. The price is not always ground-breaking, but it is occasionally the only option so they can charge what they like.
You also have to wonder at what point cutting costs extends to not doing the proper maintenance of aircraft, training of staff etc.
If you’re a nervous flyer I would find another way. We convinced someone who hated flying to come with us, and now they never want to fly again…