A few facts about P7 :-
1. The loco was never 'designed' by CLW. It's basically a WAG9 with modified gear ratio (72:20) and a few software changes. Now, Adtranz designed and developed a WAG9 :P
WAP5 was designed and developed by ABB. It's a true high speed loco as ABB planned and developed this loco for the same purpose.
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to be a bigger and heavier version of P5, its internal components are radically different from those of a P5 and are identical to those of a WAG9. In short, P5 has a different machinery (different set of motors, components, etc.)
3. WAG9, being a freight loco was developed with slightly higher HP when compared to WAP5. WAP7 inherited the same from its parent - WAG9.
4. WAP5's traction motors are 6FXA7059, and WAP7's motors are 6FRA6068. The former can withstand 3574 rpm (max rating) and 1500 HP whereas the latter can withstand 2842 rpm (max rating) and >1050 HP. P7 is winning the numbers game here - 4 vs 6 motors :P
But yes, higher rpm (revolutions per minute) of the rotor (rotating component of a motor) enables better acceleration in the higher speed bracket due to the delayed action of self relieving property of the motors. Any electrical engineer here?
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In short, the loco is more vulnerable to failure because CLW didn't develop this loco from scratch. WAP1 was designed & developed as a high speed alternative to WAM4 with maybe, a marginally higher HP. WAP4 is the upgraded WAP1 with high capacity transformer and more powerful Hitachi HS15250 motors and Flexicoil Mark I bogies.
Keeping all components intact, CLW merely changed the gear ratio and software to increase the MPS of a WAG9 from 100-110 km/h to 130-140 km/h and designated it as WAP7.
Such failures are bound to happen since it's a freight design loco pushed to its limits (maybe even beyond). But corrective measures can surely be taken :-) No doubt about that!

But, I have a deep concern about the wheel related issues of WAP-7 when it continuously increasing speed and overtaking as noted in Entry#1572347.
CLW needs to design WAP-7 in such a way so that the problems of it as discussed in Entry#1572347 can be totally avoided in this huge network of IR.
Is advance version of WAP-7 i.e WAP-7D is required like WAG-9H ?
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Phase Loco is the "Need Of the Hour" which Hon'ble GM of CLW said in his speech.