My humble opinion on Nexon's path.

While it is nice they are trying to change some stupid stuff like bosses dying in 30 sec, it is also true that an average player could not come close to the power it takes to do so. Most people can't even solo regular HT.
Unlimited will not boost the base power of characters by very much. The brunt of power will still come from upgrading, and that will require dollars. The ingame currency is so weak most people could not even begin to fund a character to the level it would take to be able to beat high end bosses.
So more HP and power to bosses = bigger gap between the heavy cashers and the average people.

I knew I was forgetting to address something! Root Abyss bosses were a good direction towards getting people on the path to fun bossing and party bossing if they wanted to do so (Since death count is a good reason why you might not want to take too many people), and then they made changes like making PDR multiplicative along with boosting the bosses so much that it's gone back to the same old "Buy NX today and you too can solo these bosses!" standard.