On the other hand, you wonder why no other fighter jet manufacturer tried the Lightning planform.
Maybe it was like the Harrier... great performance, but with very limited range - what was it? about 20 minutes endurance at good power?
The Viggen and Eurofighter and others with the full delta were highly successful -being able to fly at a very high A of A had big advantages. The Viggen could land on just a short stretch of road.
Not that I know a lot about it, just my impressions.