I think the developers need to find ways to better retain new players and make sure they can enjoy the game without feeling the need to level as quickly as they can whatever that might entail. Since they settled on 1 xp (instead of the 0 xp they originally proposed) they seem to at least understand that every player should be rewarded for their effort and the xp limit on the pies is certainly more valuable to a lower level player than an upper level player.
I am not picking, but you do know they changed this to 1 xp. James did add updated release notes I think it was yesterday.
The only way to make stone is to use an entry level tool and stone is the basis for a lot of building materials so until they offer an alternative, every level player is going to have to sue them. The use of AOE tools (an upper level item), is what provided the massive amount of resources that enable a higher level player to scale up the process (combined with teaching pies and the mass craft skill).
Edit: I guess what concerns me is the thinking that there is some need to prevent players from reaching level 50. This seems to sound like what happened with Anthem, where the developers specifically put in place required tasks that would take days to complete to hide a lack of content. The difference is in Boundless players need the levels to get the skills to be able to go to higher tier worlds, craft certain items, open portals and more. They also need the levels for the cubits to buy plots. Without plot, players cannot build and if players are not building then they are not buying building materials.