Mechanical keyboards are very good solutions for poor stamina. In my case, when I bought mine it did increase my BPM by like 20~ but the biggest gain was being able to stream endlessly at close to my max speed.
Anyway, in terms of accuracy I think silvia proved that you could be accurate enough by alternating everything. The problem is that from observance you can tell that full alternating players are not very good at doing big fast jumps, but that might only appear to be the case because there arent that many alternaters around to begin with. Another challenge it looks like they have is rotating fast 1/4 sliders. One thing you can be sure about though is that they are the best when it comes to 0108 style maps. Look at little boots click for example, and white wolf's play of made of fire.
Anyway, in terms of accuracy I think silvia proved that you could be accurate enough by alternating everything. The problem is that from observance you can tell that full alternating players are not very good at doing big fast jumps, but that might only appear to be the case because there arent that many alternaters around to begin with. Another challenge it looks like they have is rotating fast 1/4 sliders. One thing you can be sure about though is that they are the best when it comes to 0108 style maps. Look at little boots click for example, and white wolf's play of made of fire.