Simply because a game type is not friendly to new players doesn't mean the req system is intrusive. You can grind out points to get reqs from any game mode in the game.
Yes, strictly speaking, I brought up the issue of Warzone being unfriendly to new players as a separate issue from how intrusive the req system is. But, like Dax pointed out, the RP gained from arena playlists is dwarfed by how much you can get from Warzone game modes. In light of that, I think it's fair to say it actually is intrusive in this manner.
Since the req system is based off of chance and not skill or pay to get the best stuff, it means that anyone regardless of skill can get a shot at power weapons and good gear. I have never felt unfairly at a disadvantage for the random reqs i get playing warzone because everyone gets random reqs.
It's not exactly accurate to say "everyone gets random reqs". In reality, new players unlock garbage reqs, and veteran players unlock Ultra-rare, Legendary and Mythic reqs. So again, this is unfriendly to new players. If everyone unlocked random reqs, then it would be more fair, kind of like Super Fiesta is fair in its total randomness. But when it comes to unlocking reqs to use in Warzone, this is clearly not the case.
An unfair systems like in Battlefront and Destiny 1 (I have no clue about destiny 2 tbh) are nothing like what we see in Halo 5.
Enough people in this thread have already made the "it's not worse than other games" argument. The fact that other games might have more intrusive lootbox systems really has no bearing on this discussion.
That being said, i know many will say, "If you've played for a long time, you can get more gold packs with better gear that can wipe out noobs. That's not fair!"
And to that i ask, why shouldn't players who have played longer, be able to unlock bigger packs?
The reason why players who have played longer shouldn't be able to unlock bigger packs is because that makes it unfriendly to new players, as has been pointed out.
And additionally, if new players want those things, they can buy loads of packs till they get the elite gear!
The purpose of paying for packs is so that if new players do not wish to grind out the req pool, they can buy their way there. If anything, the req system allows new players to have a better shot in Warzone!
Giving those new players an option to buy their way onto an equal playing field is far from an acceptable solution. Do you really think saying "it's all ok because as long as they happen to be rich, this issue of Warzone being unfriendly to new players isn't a problem" is an acceptable argument? Yes obviously the req system allows new players to pay their way to an equal playing field in Warzone, but that's hardly a point in its favor. Let's remember that if it wasn't for Warzone, new players wouldn't have to either grind or pay their way to an equal playing field in the first place.