This is mostly a problem with 5e, Intelligence is, out of all stats, the least useful in combat for anyone but classes that depend on it.
Artificer is sadly missing from the game. Time constraints are perfectly understandable, we can only hope for a DLC here.
A campaign with Mind Flayers is supposed to feature a some important INT saves, but I haven't come across that many. A lot of skills that require an INT save are either missing or super rare, or only show up at a point where you can effectively stun your enemy for enough rounds to kill it before it can attack you.
INT checks in dialogue are missing. When adapting a tabletop game with a lot of freedom to a computer game, it is understandable that the ability to willingly investigate, or to attempt to recall something pertaining to the history of a tribe, or a character's faith, cannot always be present in dialogue, but there is an abundance of Charisma checks. Almost every dialogue comes down to Intimidation, Deception, Persuasion, or paying some gold, or attacking the NPC. There is little room to call for your ability to reason and apply logic to conversation. A lot of Arcana, History, and Religion checks are inconsequential as well. There is just so much more that Charisma can do. It is also slightly more common of a save than Intelligence.
Characters can use magical items and read scrolls with 8 or even 7 INT just fine as well. I find myself dumping Intelligence left and right. Even Arcane Tricksters and Eldritch Knights can either avoid spells that rely on INT, or simply equip that item available early on that sets their INT to a very high value.
I'd like to suggest taking another look at balancing this ability. It is the least favorite by far. Resilient: Intelligence is probably the most useless feat. Can we get some more meaningful Arcana/Religion/History/Nature/Investigation checks? Or maybe some more opportunities to require an INT save? This would make planning out the ability scores a bit less of a no-brainer, and give me a reason to set my Intelligence to anything higher than 8, and maybe grab Arcana and History proficiency as well. It's kind of pathetic to think of a Druid that utterly sucks at Nature rolls, but that seems to be the case more often than not.