I have to agree with you on many points; yes, there are some things in the game that are tedious, slow, even downright boring. I am honestly surprised there are not more rpers because it can be much more fun.
Having said that, I have a few points:
First, the game is very much in its early stages, and many of the things you just talked about are incomplete and being tested (well, the whole game is incomplete and being tested). Crafting and weapon/armour repair are very new additions, no doubt they will be modified in the next client version based on our positive and negative experiences with these game concepts. I started playing at version 3.009 and I must say I am surprised and impressed at just how many improvements have been made to Planeshift in just a year and a half, I look forward to every update.
Second, concerning metallurgy and mining: I am sure any real life miner from the medieval era would tell you it was a very dull life, and smiths had to train for several years to become masters at their trade. I personally am glad that it is not super-easy and quick for players to become master blacksmiths. Planeshift would be no fun if one could master the game in only a month of playing, personally I think the game should be much harder. I think it is a shame there are players who can hit at hundreds of points of damage when there was only a wipe less than a year ago.
Third, concerning weapon and armour repair: I agree more depth needs to go into the programming of this, so here are my ideas:
1. The higher the skill one has at repair, the slower the deterioration (reasoning: a skilled repairperson would take better care of his weapons and armour)
2. Maintanance kits or individual items such as sharpening stones should be available for purchase that can be used on weapons and armour to help slow deterioration
3. Different weapons already have a minimum repair skill needed to repair it, but once over that, any additional repair skill points should both decrease the time it takes to repair, and repair the weapon to a greater degree.
I don't understand your comment about the left hand-right hand. My swords deteriorate equally no matter which hand they are in. However, I do agree that repairing a difficult weapon should give more progression points and practice than repairing a simple one.
Actually, this would be even better if it depended on one's skill level. For example, if a player had skill level 5 in weapon repair, and repaired a sword requiring level 1, he would get little pps or practice, and much more if he repaired one that required level 5. Then if he trained to 15, a level 1 repair would yield even less practice and pps and a level 5 less than before when he repaired it when he was at level 5 himself. A level 15 repair would yield lots of pps and practice because it was difficult and challenging.
To the devs; great work, great progress

Xirius