I think it's misleading to call it the main role of the bass guitar.

In most genres, the bass is busier than the kick drum. Having the bass playing on the same beats as the kick drum would often mean that the bass would sound very slow, making the piece as a whole feel ponderous or slow. I feel that this is the case in your example.

In many genres, much of the interest in the bassline involves having it "play off" the bassline, playing on weak beats and upbeats that the bass drum typically doesn't play on. Basslines can be quite elaborate, whereas very intricate bass drum parts are unusual.

In some genres, the bass drum is typically mixed so that its lowest frequencies are the foundation of the piece, while the bass sits above it in the frequency spectrum. This makes them sound like distinct instruments, rather than blending into one sound.

I think it would be misleading to call it the main role of the bass guitar.

In most genres, the bass is busier than the kick drum. Having the bass playing on the same beats as the kick drum would often mean that the bass would sound very slow, making the piece as a whole feel ponderous or slow. I feel that this is the case in your example.

In many genres, much of the interest in the bassline involves having it "play off" the bassline, playing on weak beats and upbeats that the bass drum typically doesn't play on. Basslines can be quite elaborate, whereas very intricate bass drum parts are unusual.

In some genres, the bass drum is typically mixed so that its lowest frequencies are the foundation of the piece, while the bass sits above it in the frequency spectrum. This makes them sound like distinct instruments, rather than blending into one sound.