I think 5e could really use more formalised structure in many areas of skill use, instead of just letting GM to figure it out somehow. I'm sure many GMs handle it just fine, but when we don't have default structure for these things we also cannot have mechanics that attach to those structures.
For example if we had something like Adventures in Middle-Earth journey mechanics for making a perilous trek, then rangers could have features that provided bonuses in relevant areas.
5E should adopt FoRKing from Burning Wheel IMO. Let skills be used to support one another, and then create either feats, weapons, or class abilities that trigger when you FoRK. Would be very fun IMO.
For reference, FoRK stands for Fields of Releated Knowledge. Because Burning Wheel has so many skills that won't ever show up, you can take one skill and use it to support another for extra dice. Cap the number of FoRKs you can do at once in 5E to two.
FoR a skill you're proficient with into a skill you're not gets you 1/2 (rounded down) PB bonus. If you have Expertise, you instead add your entire PB.
FoRK a skill you're proficient in into another skill with proficiency and turn it into Expertise.
If you FoRK an additional skill, add that skill's base ability score modifier (minimum of 1). So if you make a Performance check and ForK Intimidaton and Athletics into it, representing how you're being aggressive, flamboyant, and showing off your strength, you gain Expertise (for Intimidation) and then +Str mod (for Athletics).
Allow tools to FoRK into each other as well, but not for an ability mod. This makes tool profs a lot more interesting.
Limitations are up to the DM. You can't always use Athletics to enhance your Performance. Or make it so you can only FoRK the additional proficiency if you spend Inspiration to do so.
This is a simple and elegant way to make 5E skills and tools more useful and opens up a lot of potential mechanics in the game, especially for things like exploration or the social pillar.