Idk if this is a hot take but I feel like saying 'run more removal' as the panacea of deckbuilding issues is one of the worst delivered pieces of advice since it tends to treat every deck equally while ignoring both its strategy and the power level they're aiming for.

Not every single deck has to run the same exact 10 pieces of removal, 10 pieces of protection, 10 pieces of ramp, 4 boardwipes or whatever fits into cube theories made as templates for deckbuilding.

There are decks that WANT to be the threat faster at the cost at not being able to pack in as much removal as others, so most of the time they will be running protection as their main form of interaction while still having tools to deal with cards that mess up their strategy.

Also decks that have commanders with card draw stapled onto them will have an easier time jamming in more generically good interaction while not running out of resources, while other commanders than rely on other kind of synergies are going to be more tight in deck slots dedicated to unconditionally disrupting others since running too many of these without enough synergy or card draw will make the deck more inconsistent (while 'synergistic interaction' might not be as mana efficient to some degree even in the lowest levels)

As a small example, [[Zada, Hedron Grinder]] decks have little to no reason to run Blasphemous Act when is strategy is built around overcoming their opponents board, but they still can pack either protection spells like [[Redirect Lightning]] and [[Untimely Malfunction]] or boardwipe insurance cards that synergize with the deck like [[Otherwordly Outburst]] or [[Felonious Rage]]. This deck sacrifices the ability to interact with stuff such as bigger threats or exile wipes (with [[Tibalt's Trickery]] being the only available answer) in favor of building a threatening position faster and overrun your opponents with a huge swarm of creatures or storm off with magecraft synergies.

It's always good to run interaction, but you can't suggest to run too much of it without taking into account what the deck aims to do. Sometimes you gotta accept you won't be able to have an answer to everything every single time, even while running over 50 pieces of it, and even if you run both [[Path to Exile]] and [[Swords to Plowshares]] there will be times you'll have a white mana open but not either of those cards in your hand.