After exploring some possible solutions and discussed them with editing team internally, I'm sharing an approach for both:

Enabling experimental suggestions:

• Add a new Checkbox under User Preferences > Editing > Developer tools to manually enable this option
• By default, this option will not be enabled and users who actively want to find these suggestions will enable it manually

Once enabled, experimental checks and suggestions should be clearly distinguishable:

• Using a modified lightbulb icon with (!) symbol in both collapsed and expanded states
• A text indicator below the card title when it's expanded
• The idea is to avoid the current alarming red treatment while giving experienced editors enough signal to understand what they're looking at
  icon_lightbulb_experimental.svg526 BDownload

El T429058#12119279, @bmartinezcalvo escribió:

Once enabled, experimental checks and suggestions should be clearly distinguishable:

• Using a modified lightbulb icon with (!) symbol in both collapsed and expanded states
• A text indicator below the card title when it's expanded
• The idea is to avoid the current alarming red treatment while giving experienced editors enough signal to understand what they're looking at
  icon_lightbulb_experimental.svg526 BDownload

As decided during the editing team meeting, we will finally implement the card changes in T432155.