The durability bar on Bedrock edition has a worse look comparated to the Java Edition's one, the shading of the green pixels to red are worse and it is also harder to notice the colored pixels because they get darker as the durability decreases.

Why this should be fixed:

This has already been reported and fixed on java (MC-104901) and would give better visibility, brighter colors and better accuracy to the damage bar.

Curiously, the durability bar was also updated on Legacy Console editions, but not on bedrock itself. This is sad because the durability bar is hard-coded and cannot be edited with texture packs.