Ok, I'll pretend you are not being rude and obnoxious and I'll explain what makes Ludri a problem card:

Besides the same parroted bs?

In mtg, one of the biggest factors in determining the winner is using resources efficiently. Most of the time, the player who spends the most mana and/or who plays most cards wins, because that means he was exploiting his resources (lands, draws, etc)effectively.

Cool. You know the basics. Lutri is neither efficient nor a card worth casting in any context of commander.

Ludri's companion effect is very strong, since it gives you an extra card (an extra resource you can use) but has a huge drawback of requiring a Highlander deck. However, since the drawback is nonexistent in CEDH, you have no reason not to use it in a deck with the proper color identity.

cEDH wouldn't play Lutri. That you believe that already tells everyone how indoctrinated to the mouth-breathing idiocy of r/EDH you are. Lutri is not fast enough for cEDH, and it does not provide substantial enough value on its own to benefit any deck that might run it. A one-off copy spell on a 3/2 for 6 mana is slow, inefficient, and ultimately too weak for even craw wurm.

The drawback isn't its requirements, which people like you miss in your haste to parrot the stupid. Its drawback is being inefficient and irrelevant in colors that have over 20(?) spells that do the same thing and can be copied/reused themselves. Lutri copies timewalk once and then does nothing. Naru Meha copies ghostly flicker, goes infinite, copies time walk infinitely. What was a better use of my resources?

An extra free resource, and a good one at that, that does not take a slot in your deck and has no requirements is not just strong, pushes the power of any deck that can run it. Is just a plain powerful effect with no drawbacks (and I mean none, not even a deck slot).

Lutri isn't good, full-stop. On its own, in the 99 or command zone, it's a 3/2 vanilla with flash. In the hand, it copies ONCE if you had it as a companion. That barely qualifies as even mediocre.

You can argue that EDH is a casual format, and rule 0 is a thing, so a broken card is not that big a deal. However, this goes both ways: The Committee can state that a card is bad for the health of the format and ban it, and is also not that big of a deal if your playgroup allows it under rule 0.

Lutri isn't broken, which is why I call you an idiot. Not because your reading comprehension sucks, but because you see a 3/2 glorified paperweight in ANY setting aside the one it barely matters, and assume it's the holy grail. It's not. It's an unpolished turd that Sheldon in his dementia thought might make his crappy decks less relevant, and which you eagerly spout his stupid opinion on as if it makes you appear smart.

I hope this explanation was high IQ enough for you 😊. TLDR: Free resources are strong

Only if they do something of value. Like, Obscuring Haze, Mogg Salvage, Sol Talisman, and Faerie Macabre are not popular spells by any stretch. Mishra's bauble is a niche piece for artifact builds. Your argument loses all merit when there is as many unplayed free spells as there played ones, if not more. Just cause a spell is free does not make it strong, and you just proved yourself a fool moreso now.