Limestone and borax feel very common in my game, You just have bad World Gen Seeds and are unlucky. I can travel one map distance in any direction and find some amounts of borax or lime stone. The only thing more common is Quartz. I have over 100 hours in my current world, I feel that if you can not be bothered to spend 1-2 hours exploring them perhaps you should play a "Creative Rule set" for the game. Exploration is kinda a core part for these style of games and spending a game day hunting around for that one missing block is kinda normal.
