The FGR.2 was not ready before live. The MiG-21 variants were not ready before live and countless others. Its unfortunately part of development and over a period of time, not everything can be ready in time for dev servers.
We don't show vehicles until they are finished from a 3D perspective and configured the way we need them to be for ordinance and renders. That's not new at all and well established now.
Your personal opinion is of course respected, however nothing is being rushed. We do not shape our update schedules around dev servers. We schedule them around content availability and when we can synchronise our releases across platforms, around our scheduled events plan and other core factors. All content is worked on all the way up to release.