Perfect rifle to sit behind cover with, with a view of the entrance, and wait for the LEO to arrive from the cell phone call.
All of the other comments above seem to presume your personal conditions, which you have not shared. Therefore any comments on the viability of the FAL as a SD weapon are suspect, without particulars.
My idea of home defense does not mean clearing a house of possible bad guys.
Reasons to own an FAL:
One of the best battle rifles ever. Collectable. OK, maybe a bit of a stretch on the last part but, it sounds like a justify the gun to the wife scenario.
With a suppressor, it would be an excellent weapon for a women to cover entrances with. It weighs 10 pounds, and with light bullets, doesn't recoil much at all.
It is one of the most accurate battle rifles ever. Hit what you shoot at.
The open sites are fantastic.
Marshall & Sandow give most of the .308 rounds very high marks, over 91%
one shot stops, IIRC, with as high as 93 or 94%.
Ammunition for practice is inexpensive, and very accurate.
It is one of the most proven battle cartridges of all time, and one of the most effective. It's pretty amazing how similar ballistics are settled on by almost all the major military war cartridges, until war changed after WW 2.
Great magazines, and capacity, provided you don't live in a anti-second amendment state.
Even if you do, 10 rounds of .308 is no joke.
If attacked by Zombies, we are invaded, etc. you will have a rifle able to use a bunch of old mil-spec surplus ammo.
If you are concerned about ammo compatibility with our current .223 cartridge, and the corresponding cheap ammunition, you need FAL's
in both .308 and .223.
JUST BUY ONE!
If we get a Democratic Congress, a Democratic president, and a couple key Supreme Court justices resign, the FAL might become like a machine gun in value.
Hope this helps.