They really should have dropped the 1. X1 X3 X4 T4 T5 T7 T5s T5e (or T5p) E4 E5 P5 P5s P7 and then just versioned them T4v2 or T4g10 *s being slim, e be

They really should have dropped the 1. X1 X3 X4 T4 T5 T7 T5s T5e (or T5p) E4 E5 P5 P5s P7 and then just versioned them T4v2 or T4g10 *s being slim, e being extreme or p being performance. T5P vs P5S might be confusing, so id be ok with the switch to E.