They are important because a variety of models could be taken forward. There are historical examples of things going wrong. The United States Government had proposals for a clipper chip. They wanted to stick a chip in all equipment in order to acquire an intercept capability. By the time the equipment reached developmental stage, the industry had moved on and it would have been impossible to implement the original proposals.
Time scales are an important issue.
Proposals must be framed for an appropriate time scale. By the time these provisions come into force, we may be living in a different technological world. As I said earlier, if we do not get the technology right, people will flee the straightforward providers to new providers, which develop precisely because they offer a way round current problems. Let me use an analogy from another packet switch network, the postal system, which switches packets between customers via postal boxes to an end point. Within that network, capability to intercept everything simultaneously is not sought.