Well you can have that opinion, but those spells have had components similar to that for years, so while they may sound jokey, that doesn't change the fact you were supposed to keep track of them back then... or now, if you do not have a component pouch or focus.
Regardless, they aren't just for flavor or focus- they're there to represent what's needed to cast the spell, the mundane items that have some sort of tie to the magic you're channeling through your body. And while it's easier than ever to do so thanks to the equipment available in 5e with regards to 0 gp cost components, that doesn't mean they're just flavor.
There are no mechanics in the game for needing to search for them, the chance for finding them or not, the odds of your 'live' spider being alive or dead, costs, or where or how or who to get the more exotic components from. There are no charts, percentage chances, DCs, prices, or any necessity for a die roll - the lifeblood of D&D.
That's why 5E completely abstracts them with named spell foci (for classes beyond the Cleric) and - for the first time I've seen - an explicit 'component pouch that has all your stuff'. They simplified and streamlined this edition in all sorts of ways, and this was one of them.
For example, say you get beaten to 0 hp and captured, thrown in jail. All your spells require physical components of some sort. Are you going to say to your DM "But that's just for flavor and fun!"?
Of course you take a ridiculous position and attempt to make it my ridiculous position.
There is a vast difference between the heroes having their resources taken away as part of events that unfold as a part of the central conflict of the game, VERSUS being forced to do silly item acquisition side-quests to allow someone to use an ability that the game grants them automatically. ("So, you gained the Mending cantrip on level up, but you don't have any Lodestones. You're in the middle of a low tech region, so there's no way to get them for the next three weeks. Too bad, no casting for you!")
Heroic fantasy is rife with examples of not having what you need at times, or being low on food and water, or not being able to take everything you want that isn't nailed down.
If that's how your game works, more power to you. That's not how mine go, and that's not how the default game goes. I prefer games where player's actually have to make choices and pay attention. Otherwise I'd just do MMOs all day where no one cares about stuff like that.
You're conflating things here, and presuming a lot. Most of it snobby and negative. And it's telling how you go right to the video game.
'Actually have to make choices and pay attention'... to what? Character development? Plot arcs? Dishonest NPCs? Political conflicts? Patterns of monster appearances? Odd behavior of loyal allies? How does nitpicky tracking of spell components drive any of that?
Or... (since turnabout is fair play) "Ok, when you fell off the bridge and failed your Dex save, you see you fell on your spellcasting pouch and smashed it. So, your spider web is now mashed up in the iron filings so until you go back to town you can't cast Web or Flaming Sphere. Also, (consults chart for several minutes) it's been two months since you last harvested Mistletoe, so it was dry and got crushed. Your Shillelagh has a 50% chance of not working until you can harvest it again under the full moon with a silver sickle into a pearl bowl. Oh, wait, your bowl is cracked too. And it's...(consults another chart) three weeks until the next full moon."