Countries like El salvador accumulating more BTC isn’t bad in my opinion, this will definitely result in price increase and that’s good one after all.
It won’t be bad for them to accumulate more bitcoin but the thing is they are even among the lowest Bitcoin holders among countries which hold Bitcoin even as they made it a legal tender, their resources won’t allow them to have much more compare to what other countries have acquired through seizure, price increase is not only attached to countries having more bitcoin, as that have more negative effect than positive one.