I can appreciate the interest of modeling every little subsystem, within the confines of the game here I can understand reasons for a slightly more generic model in place.
Consider this, if you first assume (always dangerous I know) that the primary focus of AH is the accurate modeling of WW2 era air combat, and that the game is geared more towards this than a true flight simulation, and one of the primary draws of that design is the opportunity to pit various aircraft against each other. Then some concessions, to aircraft operation begin to make sense, modeling each individual gear speed limit would make it more difficult for players to switch between aircraft and ultimately wouldn't add anything other than forcing players to learn specific data tables in order to tell them when to push a button on the keyboard. It would seem to detract from the ability of a player (particularly a newer player) from enjoying the game without really adding anything substantial in the process.
Of course these are just random thoughts that seem to make sense in my tiny little mind, I could be way off base. 
If the aircraft in the game are not modeled accurately then how is it an accurate simulation of air combat. If in a dog fight in a P38 and you can’t set maneuvering flaps at 50% or use gear at 175MPH to slow the aircraft to force an overshoot , how is that an accurate simulation of Air Combat?
If the aircraft are not modeled correctly how can you consider it an accurate modeling of WWII aircraft?
Here is what Hitech Creations says and I’m quoting from their web page
Aces High Game Features
Aces High is a massive multi-player online combat simulation centered around the World War II air-war. Here are some of the highlights.
• Accurate flight modeling of over 80 aircraft, vehicles, and boats from around the world.
• Fight against hundreds of real players from around the world.
• Multiple arenas with unique environments offer different styles of gameplay.
• Constant updates and additions keep the game fresh.
• Create historical skins for your plane.
• Start or join a squadron for even more fun.
• Participate in special events recreating scenarios from World War II.
• Learn from films you can record and view using the Aces High Film Viewer.
• Design and build your own terrain with the Aces High Terrain Editor.
• In game voice support.
• The most flexible view system in the genre. Tailor it to your liking.
• Full, true 3D cockpits.
• Customize your commands on the keyboard and the joystick.
• In-game secure account management.
• Auto-update in the game for all updates.
• Auto-update for all new skins released for the game.
• Free offline practice and missions.
• Free 2 week online trial (no billing information needed).
The number one bullet item states an “Accurate flight modeling of over 80 aircraft, vehicles, and boats from around the world.”
That’s just not true. If the P38L has flaps that can’t be set to ½ flaps and you can’t lower he gear at 175MPH, that’s just not accurate.
