Bridging is a double-edged sword. The main benefit is that you maintain your gains and don't have to go through the hormonal crash of a full PCT. The main risk is that you never truly allow your body to recover its natural testosterone production, which can lead to long-term HPTA shutdown. It's a strategy for professional bodybuilders, not for the casual lifter.
From a health perspective, bridging is not a good idea. Your body needs a complete break to recover. You are constantly putting stress on your liver, kidneys, and heart. The potential for irreversible damage is high. It's better to have a clean, hard PCT and a full off-cycle period to let your body heal.
The term "bridge" is often misused. A lot of guys think a low-dose SARM cycle is a bridge, but it's just another type of cycle. A true bridge is a very low dose of testosterone, usually 100-150mg/week, which is still a suppressive dose. It's not a healthy long-term strategy.
A healthy, natural body is the goal. A bridge prevents you from ever getting back to that natural state. The longer you suppress your HPTA, the harder it is to get it to fire back up. It's a path that can lead to permanent TRT (Testosterone Replacement Therapy). Think carefully about that before you start.
To sum it up: if you're a competitive bodybuilder, a bridge might be a necessary evil. For everyone else, it's an unnecessary risk. A hard PCT and a solid off-cycle is the best path to long-term health and sustainable gains.