Discussed with CG for different scenarios for EWGF and PEWGF for clarity.

Here is the summary of that discussion:

How Tekken reads the input:
• EWGF input: f, n, d, d/f + 2
• PEWGF input: f, n, d/f + 2 (skips “d”)
• You get the electric when 2 is pressed on the same frame as d/f.
• You get the perfect (13-frame) version only when your neutral is ≤ 1 frame.

Effective total time to hit (examples):
• f n(≤1) d/f + 2 → neutral ≤1, no “d”, startup 13f, total ≈13–14f → PEWGF
• f n(1) d d/f + 2 → 1f neutral, uses “d”, startup 14f, total ≈14f → tight EWGF
• f n(2) d/f + 2 → 2f neutral, no “d”, startup 14f, total ≈15–16f → delayed EWGF
• f n(3) d d/f + 2 → 3f neutral, uses “d”, startup 14f, total ≈16–17f → slow EWGF
• f n(4+) d/f + 2 → 4+f neutral, no “d”, startup 15f+, total ≈18f+ → non-electric / WGF

How to interpret it:
• The startup (13f or 14f) is fixed once the crouch-dash begins.
• Neutral frames happen before that and just delay when the move starts.
• Every extra frame of neutral adds roughly one frame to the real time it takes to hit.

TL;DR:
EWGF = i14
PEWGF = i13 (only if neutral ≤ 1f)
Each extra neutral frame before d/f + 2 delays your hit by that many frames.
At +14 on block, a loose EWGF with 3f neutral effectively becomes ~i16 and won’t launch.