Feivel,
You, too, are confusing the two issues.
How much kavannah I have is NOT dependent on whether I daven with a minyan.
Whether one is involved with communal tefillah IS dependent on whether I daven with a minyan.
BOTH are factors in how “acceptable” my tefillah is to HKBH. But when push comes to shove, the second can be dispensed with (otherwise there’s no point to daven alone when a minyan is unavailable). The first cannot.
The Wolf