And yet they are one of the most ignorable things in the game,
That is the definition of spell components being useless superfluous clutter.
Remove the spell components, and there is little or no loss.
The game is better.
right up there with encumbrance.
In earlier editions, encumbrance were a pain point a hassle to track, and not worth tracking. 5e removed encumbrance from the default game.
To compare spell components with encumbrance tracking suggests the 5e design does well to remove spell components from the default game.
But spell components are worse than encumbrance. The spell components are extraneous clutter. More, spell components aggressively interfere with the mechanics of the rest of the game.
Spell components contradict the spellcasting methods of many classes. The Dancer Bard cannot cast spells by a magical dance. The vocalist cannot cast spells by song. The musician cannot cast spells via playing a musical instrument. The commander cannot create magic by words of power. The Sorcerer cannot cast magic by being innately magical. The spell components are an ongoing aggravating pain point for many psionic fans. The innate magic of the Fey and other magical creatures stumble over the spell description and often lose access to many spells because of the useless costly component that falsely claims to be a balancing method.
The routine "spell focus" of most classes already contradicts the material component of the spell descriptions. The material component "M" is strictly useless most of the time − and is actively interferesome otherwise.
Many different character concepts need to use the same spell descriptions. Almost all classes as well certain subclasses already officially reject the spell components, by listing a focus to replace part of it. Some classes and subclasses offer other methods to replace the somatic component, such as warrior spellcasters who have weapons occupying their hands, and some cast silently. The spell components strictly contradict the rest of the game, and fail to function as a balancing mechanic, and fail to offer any benefit to the 5e game.
The spell descriptions must be agnostic about which sources and which classes are casting them. The same spell descriptions are for the spell lists of different magical sources with different theories of magic, and for the spell lists of different classes with different spell casting methods.
Spell components need to get out of the way of the D&D players.
The spell components are like an infected appendix, and appendicitis that designers need to surgically remove from the D&D game.
I would imagine you are already ignoring them right now.
The spell components actively interfere with many character concepts. The spell components are an official, intrusive, ubiquitous, useless, complicating, eyesore that is impossible to ignore.
It is wrong to make the D&D game inferior because of a disruptive sentimentality that (most?) players already agree to ignore.
The spell components are worse than something useless and ignorable to track as an accountant.
The spell components are a problem.