1st. You've just admitted you needed to go through a 'bug fixing stage' with your Growatts (that wouldn't have made me happy).
2nd. You needed an installer because you had no previous knowledge of solar systems (if I remember correctly).
3rd. Was it another poster that had all the battery problems? (EDIT: my bad that was ThaiFish)
4th. I have a Degree in Electrical and Electronic engineering, built my own batteries, installed my own system, welded my own panel mounts and it worked correctly from day 1.
Finally, there is absolutely no valid reason why the batteries and inverter need to communicate (apart from greed by the inverter manufacturer).The BMS is all that is needed to manage the batteries (I have 2x 48V batteries working in parallel).
I will also leave it to the forum readers on whose opinion they want to listen.