Currently you get 1 bright engram every 5 levels once you hit max level in the season pass.
I think it would be nice if in addition to that, you got 1-5k glimmer, 10 legendary shards, and 5-10 planetary materials each level up.
It would just be a good way to reward players who keep playing and help people stock up on resources for the next season.
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Yet another Bungie bug/feature. Have multiple materials for each vendor. Have arbitrary limits. Have unique exchange rates. Have unique earning/farming metrics. Have limits removed to allow farming without providing a way to use outside existing exchanges. Adding an trading mechanic and then remove most of it. This bug is as old as Destiny. Some fixes have been done to fix older vendors. Unfortunately the issue is with general gameplay mechanics so unlikely to change in future.