you are making me question myself here , felt pretty sure the latest models are the first one action fits all ( with a mag packer ) . last tikka i owned was a 595 and that was 100% actioned in the three common lengths as individuals perhaps I might have imagined it but the first time i noted one size fits all with a mag packer was the latest T3x. ( i was up for buying one until I noted the packer and the long action build) I did shoot a 30-06 but then that was a long action anyhow but i am pretty sure it started at 3 action sizes an an old shooting mate bought a 223 tikka that i have convinced myself was on a short action .I believe the T3 has always been one action length.
Whatever , PERSONALLY SPEAKING! I feel if i am buying a rifle to shoot a particular cartridge i would like it to be sized accordingly . I think many do ? look at why the creed is as it is at the get go , designed medium action long for calibre bullet brief ! People are going shorter still with the likes off the 6mm arc / 22 arc . CZ did the extra short action just for the hornet etc while Ruger just used a 223 to do the job .