The guideline of maintaining 3 mm between them is still widely recommended.

Bone Health: Keeping 3 mm of bone between implants helps prevent bone loss. If implants are too close, it can lead to complications like bone resorption, which can jeopardize the stability of both implants.

Soft Tissue Support: Adequate spacing is essential for preserving the surrounding soft tissue. Insufficient distance can result in aesthetic issues, such as reduced papillary height and poor emergence profiles of the final restorations.

That is what i figured, thank you!