D&D is a resource management game.
I would say that post-1e, D&D has been more of a heroic adventure game with heroic resource management. You need to manage your HP and other limited resources. That hasn't changed.
What has changed is the time scale. Whereas previously resources were recovered at a slower rate, they've generally gotten faster. There's been a shift from managing resources across the adventure, to managing them over an adventure day.
There is still still some adventure level management. Not everything recovers overnight. Hit dice, some features, and so forth. But a lot more does, like HP.
The newer editions do faster paced adventures better, whereas the older editions do slower paced adventures better. It's not that 5e can't do a slower pace, but you do need to use some optional rules or house rules, such as the one that makes long rests that require a week.
As for mundane resource management, that would probably require something like bringing back XP for gold. In a 5e campaign that I played in that focused on harsh survival rules, the DM limited the amount of food and water we could carry, and removed the spells that create food and water. It worked. The environment was our harshest enemy in that campaign. It was fine for a campaign, but I certainly wouldn't want it to be the default.
IMO, the reason for this shift is that many people prefer the faster pace, and the reduction of mundane resource managment, and the designers recognized this.