Perhaps - and that is something that needs to be fixed; I'll give 5e credit for at least trying.
Combat takes up the most rules pages (well, along with spell write-ups) in the books, probably becuase combat is how characters are most likely to die and players want the rules spelled out for that.
Combat is also where both players and DMs get to roll lots of dice, and let's face it - we all like rolling dice, right?
But combat isn't - and should never be - the whole game. There's a world out there to explore; and after that, a universe. There's a story out there to be written, whether it be the DM's overarching plot of how the world will end unless the PCs save it or whether it's the side-bar tale of Falstaffe the Fighter's endless yet unrequited love for Princess Ariana that drives his quest to become the greatest knight on life. There's a bunch of other adventurers in the party to play jokes on. There's derring-do to be derring-done, and songs and poems to write about it afterwards. There's heists to plan, and assassinations too. There's castles to build, spells to research, guilds to master.
And there's friends around the table to share a laugh with.
Each year we determine by vote among several games a series of awards, the most prestigious of which (if any carry any prestige at all) is that for Most Valuable Character. By your standards that award without exception should be won every year by the best combat wombat in the game.
In the last ten winners there are but two combat wombats.
Seven of the winners, however, have been more-or-less support characters and-or healers; all Clerics of some sort some of whom swing a weapon only in the direst necessity. And the tenth was a Bard designed as a support character and archer. If combat gave all the glory none of those would have won.
Lan-"who's calling me a wombat?"-efan