If it’s a regular thing, yeah, renting becomes massively inconvenient because of the frequency. I misunderstood your comment to mean that even a 1-time rental would be extremely inconvenient somehow.
I don't need to transport 8 people around and I can always get mulch or gravel delivered. But, yeah, it's not uncommon for me to want to easily stuff a mid-size SUV's worth of stuff into my vehicle for a weekend or longer trip. I could probably do it with a somewhat smaller vehicle but why? The longer drives are probably when I need to do so anyway.
I did also have a smaller car as well when I did more shorter regular local drives but I really don't do those much any longer other than very local drives to the grocery store or nearby hiking trails.