Okay, so after testing some decks, it seems to me that yugioh is now all about spamming monsters.
There is simply no point in making trap deck, even hand traps seem to be a waste.
The principle of duel is quite simple.
Your goal is to have card combinations, the more the better.
Trap cards simply harm the card combination, and they arent really guaranteed to work to stop opponent.
For example,
I put in my deck 3x Ra sphere mode, 3x lava golem and 2x primal being.
All other cards I put in deck serve the purpose of summoning.
For example, my kashtira deck is 3x of each kashtira card, 3x Ra, 3x Lava Golem, 2x Primal being.
And thats what works.
But as soon as you place trap cards, such as solemn, your deck starts being less consistent.
This is true since trap cards are non-combination cards.
Yugioh is all about combination cards now.
Basically, 2 or more cards which form a combination.
Without combination, you cant do much.
But trap card means one less card in your hand.
So where you would otherwise have 2 available combinations, too much trap cards in deck can reduce the number of combinations to 1 or even 0.
And since many combinations get stopped, the goal is to have as much combinations as possible.
Trap cards reduce your combinations certainly, but they arent guaranteed to stop opponent's combinations.
For example, if you go second, you wont even be able to use traps, since opponent will go first.
And if opponent succeeds in summoning monster, traps cant do anything against it.
This is very different from before.
Back in the old days, yugioh was all about trap cards.
In fact, summoning 1 monster and setting 4 traps was common play.
Now, it is basically non-existent play.
Its simply because monster spam decks got too much support.
Most of the top decks can summon over 5 monsters every turn, and traps cant counter that.
The only thing which counters that is if you also summon that much per turn, and if you have cards like Ra sphere mode to clear up the field.
