To keep in mind yes. But the root problem, as I stated before, isn't leveling. Leveling itself is merely a transition, and the slower it is without substantial content to support it, the worse of an experience it is. Thus a
grind.
But what people who are pro-slower leveling are neglecting one major problem, development wise, with their argument.
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To summarize - players wanted more low level content. So they're more one-off quests and storylines to accompany that.
They also want to get people involved in dungeons early adn throughout, but not done at the waste of created content. So they created tiered difficulty instances and dungeons.
The consequence of this is more content to level with, and as a result, faster leveling all around as there are multiple sources to level from that are impossible to tone down without making one of these elements not worthwhile to do on their own.