Yes. In fact, in Allen/Coggan/McGregor’s recent edition of Training and Racing with Power, they [compliment Xert and] discuss how Xert has the possibility of taking the optimal interval concept further by using their [continuously] calculated “Maximum Power Available” (MPA) and dynamically adjusting the length of both the work and rest in real time during the set of intervals themselves, including during microbursts workouts.
The “issue” I have with Xert is that they are inventing new metrics, such as MPA, that [seem to be] already available from Dr. Coggan (e.g. MPA is strikingly similar (identical to?) Functional Reserve Capacity (FRC)). However, in fairness to Xert, I don’t know what the licensing issues are/might be. Of course, the real solution to this issue is industry standardization such as took place in the internet world (IETF).