Your points are well understood - but "competition" is the catch-cry of the consumer.
If someone has spent two years taking an idea and developing it to the point where it can be manufactured and sold - you are saying that they should be content to see that idea go out into the world with no benefit to them?
I think this is not relevant. If there is money to be made from a product then someone will make it.
It is very relevant if the person who developed the product doesn't have the resources to get it manufactured, distributed and sold.
If there is competition then market forces will snuff out the bad versions and the best (or probably the cheapest) will survive.
... and the inventor gets even less of a look in.
Seriously, if this were the case, why would anyone even try?
In saying that, however, there is another consideration for items that are suitable - and that is to not worry about the patent aspect and simply make as many of the widgets you can and get them out into the marketplace as quickly as possible. Thus they will become known as "the original" product, and you can have them protected indirectly by a trademark. That way there may be copies made, but they won't be able to run with a trademarked name ... ever.
This is, however, only for people who have access to the necessary resources.