I thought we want 36 F-15EX ?
Anyway, getting excited for the KF-21, even the basic block 1 would be one of the most formidable fighters in ASEAN. It would be a good replacement for Vipers, especially after the 2030+ period where we'll be retiring those old birds.
50 KF-21 is already excellent for the first batch, would be better if we continue to the next block 2 and block 3. KF-21 should be the workhorse of the air force the way the F-16 usually does.
Indonesian Air Force assets 2030 upwards should be a mix of KF-21, Rafale and F-15EX, while we get rid of Flankers and retiring F-16s.