Weapon trial is probably HAL's workshare, indeed the integration part is. HAL in turn is likely dependent on DRDO where the delay can happen due to many internal agency at work (software, DAS, QA etc)
^^All of that considering Mk1a is majority HAL own work so maybe that is why IAF is not happy ie they are ignoring any delay coming thru DRDO side (Astra integration part). Initially the firing trial it seems ASRAAM & gun fire as basic capability and even that was probably pending due to no engines. Bombs JDAM LGB etc are not that heavy issue. Astra can be done later since integration is DRDO dependent. But the primary weapons also had delays for a proof firing.
Workshare allocation is probably defined by the SOP doc for Mk1A vetted by CEMILAC and signed in 2019. I hope there's no goal post shifting happening at the last minute.
Imo, software testing could've been done on the LCA Iron Bird test rig. And then rolled out progressively to operational Mk1a units (considering Tejas mk1 has already demonstrated CCM, BVR and LGB firing, including in live exercises)
Software tweaks are an ongoing process as the IAF adds more weapons to its inventory.
. Any potential exports can even begin to be considered only after 3-4 years at this point. Until then we can potentially offer ballistic missiles like Prithvi along with more Brahmos. More specifically Phillipines needs advanced targeting AND ISR stuff to truly make Brahmos lethal.










