Konami forcing you to buy link monsters by nerfing extra deck summons RIP so many decks. It also forces putting the cards in the already tight extra deck. Well the mechanic sounds convoluted, seneth switche could be cool.
So for pendulum summoning, they cost spell and trap zones, meh, it could be worse. It's not that pendulum decks could run many spells an traps anyway. Also since techinically pendulum monsters are main deck monsters (no matter their location) I think pendulum summon from the extra deck can still be done without a link monster.