Most of them require running a separate blockchain that is not the most secure in comparison to Bitcoin, and most of them seem to be centralized (or at least not as decentralized), and having to deal with a currency that is not as solid as Bitcoin, and for those that have used Bitcoin, they're adding non-transactionary data and bloating bitcoin with said data where aside from being limited by their sizes, there might be a future that these loop-holes get removed.

So I basically looked at all their problems (from what I knew and from what people have mentioned), and thought, "Can there be something that doesn't have any of those issues?" and came up with this solution with those points mentioned in the OP.

From my pov, it seems like this solves all those issues, scales well, and is secured (without bloating/adding junk to Bitcoin), etc.