Why is it so hard for modelmaker to do an accurate representation of hermann graf Bf 109 G6? (2 Viewers)

Hello, it's been a while I've been here. I'm asking this because I saw eduard didn't gave the WGR 21 or the different canopy to do his plane but still had it as an option. I do find it odd since they could've odne those modification as a BFC kit or aftermakert accesories for the canopy and landing gear hatches.

Thanks for your answers, I went to buhl this weekend and grabbed a eduard 109 G10 royal class and a revell arado 555 for the WW2 themed kits (I also got a douglas DC 9 from airfix and a ural 4320 from ICM).

I'm talking about this aircraft by the way: