A real DTC (this example for the A-10C) consists of the following. What you suggest wouldn’t solve 99% of the issues.
The MDTC provides the ability to input mission data into the CICU, EGI, CDU and LASTE equipment of the aircraft. This data includes:
-Waypoints
-Flight plans
-GPS Embedded Module (GEM) Operational Flight Program (OFP)
-EGI OFP
-Symbol Generator
-Voice Message Unit files
-GPS almanac
-GPS Cryptographic Key (JDAM)
-CDU initialization file
-ARC-210 configuration data
-TAD display settings
-TAD map overlays
-HMCS Profiles
-Threat data
-IFF OFP
-LASTE pilot preferences
--Weapons inventory and profiles data
--Launch region coefficients
-DataLink (SADL/VMF) configuration data and message upload
-Targeting Pod configuration data
-Data and Settings Upload
-TAD profiles
-CICU Data Pump definitions
-Digital Terrain System Application Software (DTSAS provides predictive ground collision adoidance system warnings, obstacle warning cues , and target ranging info on the HUD)