Green peppers are unripe and so the seeds generally don’t grow into anything
also the second generation of plants are mostly way worse than the first (which produced the fruit that you buy)
I don’t get this statement. Like is there some ancient pepper plant that all seeds come from?
From PSU:
It is important to know that not all vegetable varieties are suitable for seed saving. If the variety you want to save is a hybrid, seeds from that plant will not produce genetically true fruits. Most likely, the plant will produce a fruit that resembles one of the plants used to create that hybrid. To avoid this, choose heirloom varieties, ones that have been around since grandma’s time or earlier. […] Heirlooms will produce offspring that are identical to the parent.
Cloning plants is a thing people have been doing for a long time, and is one popular way to get good produce.
You also take a set of carefully selected plants and carefully breed them to get a plant that has the desired profile. It’s the deliberate nature that results in a better food, not “not being a replant”.
Pollinators don’t care which plants they combine, so the natural way often produces a fruit that isn’t as good as a food crop.
It’s the real reason most farmers aren’t actually super into reusing seed. It typically results in a lower quality yield.