I think what Dronni is trying but failing to express is that when your inventory gets full more easily, you are forced to make more trips back to base to unload, which means you spend more time in the gameplay loop of exploration which is what they like. However traveling back to base is easily the worst part of exploration, since you're typically going back through places you've already seen rather than finding new places, and even if you do find new places you have to leave loot behind, so it's not satisfying. If anything, I feel like this change will make the exploration gameplay loop better since you can spend more time looking for new stuff.
Personally my only complaint would be that it kind of breaks immersion that my character can just stick 9999 furnaces in his pocket, but then sticking even a single furnace in your pocket is also pretty ridiculous. Maybe if the player character visually had a backpack or something on, then it could at least be explained away as a magic backpack. I guess you could always say that Terrarians just have magic pants.