https://www.youtube.com/watch?v=LucoiQY5CoE
He's right. Exact same thing I've been arguing for for years now.
The side deck exists only to create non-games. Nothing wholesome or cool is placed into the side deck, it's just shit to scum out wins by floodgating or blowing your opponent out of the game.
>Oh I'm vs Maliss? Let me just place this card Lancea into my deck that makes it so if I open it I automatically win because they cannot do anything under it other than pass turn
It is essentially Harpie's Feather Storming them but in handtrap form. Speaking of which
What's the result
>Oh I'm going first? Let me just place Harpie's Feather Storm into my deck to skip my opponents turn
Wow, what a great game that creates!
>Oh a backrow deck is in the meta? No problem let me just side in these Lightning Storms, Feather Dusters and Evenly Matches and before it was banned Red Reboot which all basically single handedly win vs the backrow deck.
>Oh I'm going first? Let me just side out all these charmie's and put in TCBOO, Anti-Spell Fragrance, Skill Drain, Dimensional Barrier and the Solemn brigade

The side deck isn't some cool feature used to even the playing field like people will tell you, it's a cess pool of silver bullets and turn skips and it encourages one dimensional deck building in the main deck.
Now I already know most of you fags will disagree with this just because or you'll make the same retarded claim that I just want MD features (literally do not play MD, haven't played since season 1, it's not even installed on my computer and I've been making this argument against the side deck for longer than MD's existence) but that couldn't be further from the truth.
Nothing good has come from the side deck, whatever intent was there when it was made is being abused.
The cards that get abused in the side deck like the ones I mentioned above only are a problem BECAUSE of the side deck. Without the side deck you'd have to weigh up the pros and cons of using them.