Every technical class is going to teach you something about decompression and something about calculating gas requirements and reserves. GUE is one of the more conservative about ENDs, and introduces helium at the beginning of technical training, which not all agencies do. GUE is also very conservative about ppO2s.
A lot of people get confused about the team concept. Diving as a part of a team does not in any way absolve you of the responsibility to be self-reliant and reliable. We all start with personal redundancy and the skills to manage that redundancy; diving as part of a team gives you ADDITIONAL resources, if yours are insufficient, or if it would simply be easier to solve a given problem with the use of your teammates than it is to do it yourself.
GUE does not condone solo diving, at the recreational or technical levels. The equipment is standardized, the gases are standardized, the deco is standardized, the emergency procedures are standardized. The class is very standardized -- the degree to which a Tech 1 class will vary around the world is fairly small. Standards for the classes are published and public, as are the criteria for student evaluation and the scoring system. When you complete a GUE Tech 1 class, you will be able to get in the water and do a T1 dive with any other, similarly trained diver, without spending much time at all on how things are going to go, other than the immediate dive plan. This is not the case with other agencies, where there can be much greater variation between classes given by different people or at different times.