"How can I know which item is better? Can you add the stat difference or changes with +/- or with some info when we checking items, so that we can have a grasp about items?"

Please, no. Don't do this.

The recommendation is fine. I don't -think- he is asking for Gear Score, but if Item A has +20 Status Chance and Item B has +28 Status Chance, I wouldn't mind a recap at the bottom that says "Overall changes: +8 Status Chance". That is pure Quality of Life and it existing doesn't suddenly make gameplay any easier, it just makes you save time by not having to do math and reading 10 lines of text on every item comparison.

No, that is for lazy people that don't even look at the stats of the item.

Or people who struggle to read the non-adjustable font, both due to a disability, or a resolution the game doesn't support.
Or people who struggle with basic math.
Or people who want to compare every single item at a quicker rate.
Or people who can't tell "Is that a 6, or an 8?" (SImilar to point 1).
Or when you struggle to tell "Is that a -, or a +?" due to, again, point 1.

There is no reason to not make a mechanic simpler, and more accessible. Just because everyone has to manually figure out if 24 is greater than 20 doesn't make it harder.

The more accessibility built into the game, the less hacks that will be implemented.

Yes, there is a reason they didn't implement it. And I hope they keep this way.