Participles, among the non-finite verbal inventory, most often appear to be taken by linguists as being tenseless or having the feature [-tense]. This is due to their interaction only with the Aspect layer, meaning that the TP layer should not be projected. If the TP layer was not projected, then we would account for the absence of phi-features agreement with the subject [person, number, gender].
But why is this the case, why TP layers are not projected in the participial clauses?