Mind blowing concept here...
Just don't use mechanist if the loss of toolbelt skills is too much to handle?
The mechanist offers a new way to play engi. Its not about what you lose but what you gain from this spec. They did say that they're really changing things up for most of the professions ( mesmer no clones/thief support/engi no tool belt/necro glass cannon so on so forth )
Rather than being doom and gloom over beta numbers and interaction. Post your concerns and move on.. the beta hasnt even started yet for people to try it. We know most of these numbers etc will change.