Sorry, but I don't see how any of your points proves that this was the best thing ever happened to Bitcoin. I see it as a pretty bad thing, because this bull run was shorter and smaller in terms of relative gains, compared to the previous bull cycles, which means that the rate of Bitcoin's price growth could be slowing down. Though it's a pretty expected thing, because at this point almost everyone is aware of Bitcoin
I think you countered your own counter argument there though. Bull runs, are expected somewhat to slow down, in terms of the amount of people buying in, and the longevity of them. In theory, as more people invest in Bitcoin, the more it should become stable. the longer, and the closer we get to the limit it shouldn't be so volatile. This is helped by the block rewards being reduced as time goes on.
So, while you might be correct in it not being a good thing, I don't see it as a necessarily bad thing. It entirely depends on your perspective, since if you are a opportunistic investor then this is a good thing, and all the previous times it was a good thing. If you are someone who wants to use Bitcoin as a currency, then of course this can be seen as a bad thing, especially if you are focusing on Bitcoin as a currency right now.
There's always two sides of the spectrum, so there will always be people who benefit from price drops, and those that lose out. Usually, this is linked to confidence in Bitcoin, the reasons for investing, and what they intend to use Bitcoin for.