Anything can break. But in case of preamps, reliability issues with ARC linestages are most likely limited to the units that have tubed power supply - REF2, REF2MkII, REF3. That's probably what you have read. You have to watch out for the power supply tubes and replace them on time. There is definitely a potential that a failed PS tube can take out a resistor, etc. So that would definitely be possible.
If you want a tube preamp that you won't have to worry about tube rolling or mods, LS-26 is the way to go. If you think you would like to experiment with tube rolling, then the 6H30 based pre such as LS-26 iswn't for you, because there is no tube rolling the 6H30s. But the advantage is that the tube lasts longer, and you won't get on a merry go round of tube rolling, which can be fun and frustrating and expensive all at the same time.
Good luck assembling a new system. It is fun!
If you want a tube preamp that you won't have to worry about tube rolling or mods, LS-26 is the way to go. If you think you would like to experiment with tube rolling, then the 6H30 based pre such as LS-26 iswn't for you, because there is no tube rolling the 6H30s. But the advantage is that the tube lasts longer, and you won't get on a merry go round of tube rolling, which can be fun and frustrating and expensive all at the same time.
Good luck assembling a new system. It is fun!