I have been using the FG knot , 40 lb braid to 70 lb braid leader for about 5 or 6 years now, never ever had a knot failure at all.
The lighter braid really ‘ bites” into the heavier braid creating a nice slim join.
The harder you pull the slimmer the knot gets .
Ideal and see no reason to change things .
Or, if you like, dont try to fix what is not broken.
I always tie leaders at home, and although I carry spares I have never ever needed to tie myself one on the beach , although I did tie one for a mate who snapped off ten days ago. He had never seen an FG knot tied and was suprised at how quickly it can be done.
Dave