I accept that too. I use all the modes at various times and I'm well aware that not everyone in Open will play as I do.I've played in Mobius PvE for years. Since before the sundering of the original Mobius PG. But, I still think, that if you log into Open, you have consented to be general content. If you are in Open, it is your choice, and you have do accept the consequences, in the end, they are minor.
However, I would add that anyone playing in any mode other than Solo is also consenting to be blocked by any other player who doesn't like how they behave; that's also a provided feature in the game we all bought. My advice is always to play in such a way that we all have a good game experience, then instancing won't need to be modified by block. I always try to follow my own advice.