The reality is that progression systems do not have to be eliminated entirely, but something has to be done to mitigate the explosion of progression systems in non-RPGs and to constrain grinding or any other type of lizard brain/gambling exploitation in video games.
Progression systems could be interesting if they were based on success-reward models or trial and error, but they tend to be a matter of increasing an experience bar by doing a bunch of repetitive and increasingly uninteresting tasks. The problem in my view is not so much the existence of progression systems as the cheapening of them into behavioral systems in subscription-based systems.
This is a serious problem, some people are literally dying in gaming cafes in South Korea because they are trapped in these little skinner boxes.
Exactly. The official model of current progression-based games is basically this:
1. Get the player intrigued by the setting and theme.
2. Get him addicted to the progression system before the thin layer of the above wears off.
3. Profit!
Mostly related to subscriptions and microtransactions, but it is, sadly, the easier way for single-player games as well.
Another problem is that it's actually quite hard to create mechanics that reinforce acting in-character, instead of creating a completely unrelated meta that becomes the meat of gameplay. Instead of envisioning your character and then picking appropriate abilities, you are supposed to study the progression trees and optimize available choices, unless you want to end up with "lol bad build". Characters and archetypes get degraded to sets of stats like HP and DPS.
A strategy guide should never, ever be an improvement to first-time-around experience. Yet, how many games are there that eventually don't slap you in the face unexpectedly unless you have some foreknowledge?
Well, some games are obviously meant as character building exercises, but most actually have a story and/or world to enjoy.
I do enjoy optimizing my characters in RPGs, be it PC ones or PnP. But I can also clearly recall that my most memorable moments are those when I ignore or go against my "optimizer's itch".
And yeah, I'd consider some progression-less games more of RPGs than most full-fledged ones (Thief and Stalker comes to mind).