What are the F-35 operational/training squadrons doing?

Currently there’s a few squadrons equipped with F-35 for training/operational fighter-attack purposes:

VMFAT-501 (USMC) – training
VMFA-121 (USMC) – operational fighter attack squadron
58 FS (USAF) – training
VFA-101 (USN) – training

What sort of training/missions are these squadrons performing given:

1. Helmet doesn’t work

2. Aircraft is under extremely limiting flight restrictions due to incomplete testing and faults such as engine exhaust damaging flying surfaces – no supersonic, extremely limited flight envelope

3. Weapons integration work has only started.

4. Tactics development incomplete as well.

5. Logistics system development only limited (big impact on VMFA-121 as an “operational” and thus hypothetically a deployable squadron).

I read somewhere that their main role was aircraft familiarisation with extremely basic flight profiles pending lifting of restrictions. Is this correct?

Are these squadrons (especially VMFA-121) purely propaganda?