Which "they"?
War Thunder's 3D production team did not create an interior cockpit for the DB7, Boston or A20G and the exterior view shows almost a duplicate of the exterior view from our new screen shots. No armored glass to protect the pilot or N3C gunsight. The A20 production models including export had an armored windscreen to protect the pilot. The glass nose bomber version(s) only had the flip down iron sight while the P70, A20-G\H had an N3A optical sight and the flip down iron ring as a back up. The lend lease A20 to Russia was retro fitted with their optical gunsight since it was an attack bomber along with they practiced masthead bombing of shipping and had a specific reticle for targeting ships in that role. The pilot had protective glass in front of his face since both the attacker and bomber versions had forward firing guns for straffing.
Here is an A20H attacker being restored in NY, it was shipped from the factory with the gunsight hole in the instrument deck like the G, it's a stock A20G with more powerful engines R-2600-29. The engines the A20G shipped with were going out of production R-2600-23. In the picture you can see one of the two lower mounting flanges for the bottom of the armored glass.