The distributions are high primarily because this is a covered call ETF. It generates more income not through dividends, but through the writing of covered calls.
I'm not sure how much you know about covered calls, so here is piece we wrote in late 2020 going over some basics of options and covered call writing
https://www.stocktrades.ca/premium/selling-covered-calls-an-excellent-strategy-for-more-income/
Obviously, ignore the prices and dates in this piece, they're a bit out dated. But the information is still completely relevant.
After you read that, you'll likely realize that you're capping your upside by selling covered calls. This tends to do poorly during bull markets, and oil is very much in a bull market right now. This is why a fund like ENCC is underperforming a non covered call ETF, and one I own in XEG. I've attached a chart of year to date returns.
What I tell most people with covered call ETFs, if you need the income, they're perfect. However over the long run you will sacrifice returns for that income. This isn't really up for debate either. It's prevalent in virtually every single covered call ETF out there. If people do not need the distribution at this current point in time, I don't see much use, if any at all, for covered call ETFs in the portfolio. I know plenty of retirees who own them, and they're perfect products for those who need income. But I also know plenty of 20-30 year olds who own them, and it doesn't make much sense in that case.