On numerous occasions media present High Court's decisions about public figures or entities and each time I notice mentioning that the motivation will come sometime in the future.
Picking a random recent example, the High Court decided that a certain opposition political alliance can run for European Parliament elections.
However, there is not clear how it reached its decision, as motivation should be issued at a latter time.
I do not know how it works for other countries (High Courts or equivalent), but it seems strange to have a separation between the decision and motivation, especially when speaking about such important trials (decisions are final at this level).
Question: Why high courts decisions do not also immediately issue the motivation for their decisions?