The terminology matters considerably: An affect that gets you advantage on ability checks does NOT affect attack rolls and saving throws, but it WILL affect skill checks, tool checks, and unmodified ability checks (like a raw Constitution check for a forced march or a raw Strength check for busting down a door).
At first I thought it was silly not to consider attack rolls and saving throws as subsets of ability checks, but it actually makes sense, because attack rolls and saving throws are very important for combat balance so the rules tend to give them bonuses a bit less frequently.
At first I thought it was silly not to consider attack rolls and saving throws as subsets of ability checks, but it actually makes sense, because attack rolls and saving throws are very important for combat balance so the rules tend to give them bonuses a bit less frequently.