Hmm. As soon as you have tungsten, you can make a bedrock breaker, and it doesn't take long from there to get bedrock tools, so personally I probably wouldn't bother spending that early tungsten on tools that would soon be obsolete.Actually, I've got a suggestion...dunno how viable it is, but here goes: tungsten tools as an in-between between HSLA and bedrock. They could be quick and immensely durable, but not as powerful as the bedrock tools. I think it'd be a neat feature in RoC-centered packs or even just as a gift to friends who aren't as far along in the tech tree to help 'em out.
(Granted, you also need a couple of microturbines and a good few buckets of jet fuel to get the bedrock dust, but if you're planning ahead, you'll already have those by the time you get your first tungsten...)