Model talk aside, if there is Synaptic Link tech implemented, it would probably require an implant. I assume that so far in terms of implants, each soldier is only allowed one at a time (permanent, or requiring hospital/recovery time to swap). So, soldiers with other implants may not be able to use this 'heavy' armor, while soldiers using this heavy armor may not be able to reap the benefits of other potential implants (psi offense/defense, reflex, targeting, etc., though the armor could convey some of these benefits in a lesser form).