When the fitting is first created in Target software, the audi (HCP) has the option of setting the experience level of the user. The default setting appears to be "first-time user (0-3 months). More advanced settings are available from a dropdown (see picture):
If the audi has already created an entry for you in the Target database, there are probably ways to create a new fitting for you, set the experience level differently, and import all your other data from another entry of “you” (and recalculate your fit to the greater experience level).
Here’s a post on the forum from many moons ago - 2016!!! - (and a much older version of Target software) on what the user experience setting does. It mentions a linear vs. a non-linear fit, too. If there’s that option in current Target software as well, maybe a DIY Phonak user can comment on whether that settings option is still available and where an HCP can find it. Both user experience and linear vs. non-linear are available for current ReSound HA’s. ReSound said in its literature several years ago that the linear option was just a vestige left in the fitting software to accommodate “old-timers” coming from analog hearing aids!, IIRC
Personalizing Patient Fittings – The Official ReSound Blog (gnresoundblog.com) (says experienced non-linear ultimately best for speech recognition, but the user needs to acclimate, etc.)