It kind of sucks being a new player

[RedShipRaider]

It's funny that for both the Low Level and Trial roulette you only need to have them unlocked, and you can get thrown into a duty you have never done before.
Which, especially with Trials, but also in Low Level since you are a new player then, can be quite challenging.
Yet for HM, which are heavily over-geared by everyone, and present little to no chance of wiping, you need all. :X

That only became true for Trials with 3.0. Now that they have more story-progression locking Trials, they needed a large player base for people to run them with.

There is no such reason to open up the Hard dungeon list, since it is dead content. No XP and nothing new being added to that list means that there really isn't any reason for new players to get into it other than just wanting to see what it's like. And no, the 100 Daily Roulette Poetics of Law are not a reason to, considering how much easier it is to just get them from the new dungeons which are not limited to once-daily.

It seems like a lot of the OP's problems are based on misunderstanding. Hard Roulette is ~not~ an effective way to get Laws. Grand Company advancement is something that is baked into many aspects of the game. Other than the rather ridiculous number of mind numbing FedEx and "Go kill 5 rats" quests that have nothing to do with story progression that have to be ground though in order to get through content gates, there is really extremely little keeping new players from catching up with old.