Well there is also the fact that the openjdk codebase is huge and so even though it is quite well written and documented fixing a bug in the jdk (and especially

Well there is also the fact that the openjdk codebase is huge and so even though it is quite well written and documented fixing a bug in the jdk (and especially a bug in hotspot) isn't easy. Although tbh i have no idea how the quality of support is with Oracle.