First, I believe Bungie stated during the Lightfall reveal that they are looking into ways of reworking light/power level and how it works. They may alleviate some of what you feel. Second, don't forget that we have had this model for nearly 3 years (Shadowkeep, Beyond Light, Witch Queen). I would say that going forward will be no different than before. My best advice is, unless you start speedrunning or doing lowman raids or in general focusing on endgame content with a clan, to find additional games to play when Destiny gets too grindy/boring.