Directly comparing them to PF is kind of a straw man argument
I did not compare them and I did not use the comparison is an argument, I made a simple test and provided the results.
when Panzergrens are more or less the same style of unit as Penals that start with full AI and can downgrade their AI if they need to use AT.
Not really:
1) Panzer grenadier come later after one has produced several unit and in most cases are not the core of army
2) Panzer grenadier cost 340 manpower which is more than the 300 of Penal
3) Panzer grenadier upgrade cost 100 mu
4) PAnzer grenadier lose almost half their AI when upgraded Penal lose alsmot 2/3
5) Panzer grenadier do not get snare
Even so you can repeat the same test I did using Panzer grenadier I doubt you get different results since the shreck are similar. The comparison will only make AT Penal appear more cost efficient since PGs are more expensive the PF.
If PG where available before minute 1 I would post similar things with what I post about Penals.
The only difference is that both Fusies and PGs are both in the HQ building and can organically be part of a build order whereas Penals are essentially side tech, which needs to be considered.
Nope, Penal are not a side tech.
T1 is normal tech that unlock t3 and Penals come with satchel, PTRS, AT satchels with no additional side tech.
Quibbling over slight differences in cost efficiencies or whether or not Fusies are better/worse than Penals because of a munitions investment for G43 package doesn't invalidate the concept of the PTRS package when it's all basically the same design with small variations in costs, timings, and tech paths.
Again not really.
The design of PF is that of an alternative mainline infatry to supplement VGs, with two clear paths, AI or AT.
Penal have been bandaided so many times that they simply do not have any design.