My, hasn't this turned into the usual kick fest whenever R8s are questioned.
I used to own an R93. I now own an R8. The OP may well have been seeking to promote a discussion, but that is not necessarily looking to start an argument.
His question was reasonable, and I believe, easily answered. Cost, simplicity, and bang for buck.
Ownership is not necessary to form an valid opinion about anything, provided sufficient research, physical examination, and quality thinking are undertaken before that opinion is formed.
As is is well acknowledged, the R8 offers what is probably a unique feature set. Particularly in a market such as Europe, this feature set, and the turn key nature of the package is wonderful. No set up - no tune up - no bedding - nothing - just bolt it together and it works, with a very high level of accuracy. Plus the portability and the multi calibre flexibility, both of which, again, have their genesis in Europe.
That these qualities justifiably appeal to many outside Europe is self evident.
However why can no one seem to acknowledge the trade offs ? Cost and complexity.
The Blaser design appears aimed at preventing the incursion of gunk, which is admirable. Fast running alpine rivers in New Zealand ( and probably elsewhere) carry large quantities of "rock flour". This is much finer than gravel and is extremely abrasive. Immersion of one's rifle in such a river, usually via a fall or stumble, WILL see rock flour in the internals. With a M70 or similar with a 3po safety, the bolt can be quickly dissassembled without tools and the pieces rinsed in clean water. Clean water can be flushed through the trigger area as well, and you are back in the game, at least until proper maintenance and care can be performed.
Try that with an R8 bolt and trigger cube.
I am fortunate that I don't hunt any where with fine dust, but if I did so, I would take a lot of care to try and keep it out of my R8, as if it gets in, getting it out in the field will be extremely difficult. I am also fortunate in that I acknowledge, and like to think I understand, the vulnerabilities of my R8 in this regard and have the mindset to hopefully compensate for those vulnerabilities. I do not ignore the existence of those vulnerabilities.
A busy working guide or PH is unlikely to have the time, inclination, or headspace to do what I do.
As to cost, it simply makes no sense to pay for the Blaser feature set, if one has no use for it. People who work at hunting for a living, and use their rifles on an almost daily basis, do not need take down, or switch barrels. They do not have have time to look after their rifles as some of us may, and many of them simply don't care.
In these circumstances a good CRF turnbolt makes more sense, both practically and especially financially.