Stopping operators from getting spare parts through CAATSA can be considered overkill and a hard sell, but limiting what operators can upgrade and having their assets naturally become obsolete is easier to sell politically.
Both arguments basically if we see the article on LM F-16 plan are something that being put up by LM toward Indonesian AF concern.to stop the delivery of spareparts, which will cause grounded aircrafts, will make Indonesia and other countries think twice to buy american defence equipment.
LM off course give options for F-16 packages but in the same time, like I put few months ago, concerned for overly depend with US still there.
The idea to diversify the Defense assets is still strong within some circles in MinDef. Flankers it self basically being procured not only to diversify but also to put politicall points with US.
Must remember that Soeharto that put the idea for Su-30 when Clinton and Democrats in Congress stop Indonesian effort to get more F-16. This after the Bush Sr still give endorsement for more F-16 even after Santa Cruz incidents.
The idea of Democrats will take over US Presidency after November, I suspect still put some unease within MinDef. After all as I put before, Indonesian relationship with Republican Presidency usually quite good, while Indonesian have more up and down relationship with US under Democrats (especially Carter and Clinton).
That's why even going all out with F-16 will be more logically done toward TNI-AU condition, MinDef will still try to find something else to compliment F-16 eventough it's not very logical choice.
This talk by on Rafale or Eurofighter certainly on that direction. MinDef now talk much with German and French. Even Democrats take over Presidency after November, CAATSA will still be hold someway. As this act has Bipartisan support.
We can't totally avoid Risk of Embargoes from US, Euro, French, China or even Russian. However since we're not doing anything with East Timor anymore, the chances also much smaller.