It will be the same fate in LH Senator lounge

I can't understand why there isn't a *A F Lounge in FRA
There's no physical space to put one. Most *A flights use B gates, not A gates. Some -- like SQ on the westbound -- use C gates. All three of these areas are now effectively sealed off from one another by the sub-division of
T-1 into two airside zones, one for arrivals, one for departures.
They could put one downstairs in B, but only if they take back commercial space that is leased for Duty Free. That ain't gonna happen.