MiFID II gets my pulse going. Still, this does not mean that you can only trade UCITS ETFs from now on. Recently I've successfully enabled a non-UCITS ETF for trading for myself, specifically QQQ3, by contacting my broker and telling them that the KID for QQQ3 is available online (since September 2019 apparently). After a few emails back and forth it seems they are now in the process of enabling access to it.
A note on MiFID II. Why the fuck are ETFs not allowed, but derivates and futures are all good? Political bullshit. The people benefitting from this are most likely a minority.
A note on QQQ3. I am starting an experiment with this. I know this could be FOMO, but still. I will start building a position in it with a minor percentage of my account. The thing I always need, and this might be something psychological, is a position in something. Else I won't track it. If money is on the line, it gets my attention. And even with a drawdown of like 90% (on QQQ3), I will still have the motivation to fix the position. And this is important for the next recession.
Bigger backtests incl. optimum leverage: http://ddnum.com/articles/leveragedETFs.php