You do need to keep tabs on whether they are or not, that is true - and you will have a bit of management to do if they are under constant heavy write load. For

You do need to keep tabs on whether they are or not, that is true - and you will have a bit of management to do if they are under constant heavy write load. For me, this all works out because I don't have too many tenants - and I have tools to block writes when running migrations. It's all tradeoffs after all.