I find it funny and sad in equal measures when I read these comments about 'don't do bluetooth so no point in having it' and the advice thereafter.
If you take the
Victron SmartSolar as an example, the bluetooth lets you - or someone else on your behalf who DOES actually do smartphones - configure the device in an optimum way, and to update the controller if there are improvements to the firmware for it.
Go for a 'dumb' unit and you are stuck with it and any improvements to the design will bypass you. Just because someone doesn't 'do' bluetooth doesn't mean the feature is of no use to them