In that you can only gain one Season Clan Level per week, sure. Larger clans will just hit that quicker.5k per week, per character. Is there also an overall limit that penalizes larger clans?
I'm a big fan of looter shooters with recently getting into Warframe after Boaderlands. I never did play Desinty tho. So I'm on the fence and still waiting patiently for the reviews to complete so I can make finally decide.
I watched this. I'm sorry I did now ☹️
https://youtu.be/ufqZTk1D2xE
Yeeeeah, definitely wait for and wait for and give this guy's review the diligent study it demands

Anyway the base campaign at Recommended or higher power (which he is) is tuned to be doable by players of all skill levels who just wish to experience the story, and is not a good representation of available challenge in Destiny. It's simply not intended to be hard. If you are more skilled you can complete campaign missions well below the recommended level for more of a challenge, or participate in endgame activities. Completing the story is basically the start of a character's progression in D2. Considering how Borderlands structures its challenges I don't think what he is complaining here about would actually impact your enjoyment much.