Is there an alternative to the powerwall that is functionally similar, in terms of power density and utility, but doesn't have things like a network stack and other wifi / IoT / "smart" features ?

We are just about to install lithium battery backups in our home and, of course, the Tesla powerwalls are an obvious choice, but I don't look forward to having to disable/reenable the network connectivity on them, manually, in some cat-and-mouse with Tesla for updates or whatever...

In fact, I'll bet that most (all ?) of the updates that Tesla has to send the powerwalls are for the update system, and accompanying network stack, itself ...