This is entirely because they had to fork their product and codebase between cloud and on-prem, and their resulting total failure on execution on their internal product roadmap. Atlasssian has demonstrated a chronic inability over the past few years to maintain feature parity between what are effectively two different products. Atlasssian has had a really, really terrible feature execution delivery pace over the past few years - "Next-Gen Projects" were so immature at launch they were useless, and have been incredibly slow to mature.

So they need to focus their developers onto building features on the Cloud product codebase, but I am not hopeful that this means they'll actually ship features faster.