It's not so much that - my area is a mostly rural area, and stations often cover a large area. I play as realistically as i can, but many of the stations (irl) only have 1 appliance, so yes I add an extra pump at some of these or the odd hazmat & WrC dotted kind-of strategically around. but its more that the missions are disproportionately generated in an area.
Just earlier I had a station in the middle of nowhere with 1 pump generate 3 missions - 2 of which were 8+ appliance incidents - within minutes of each other - requiring units from 20-30+ mins away needing to be called. Now IRL 30 mins is perfectly reasonable - but 2 large missions like that in such a remote location is less so reasonable... meanwhile I have mainly smaller calls in the city which as 3 stations .
Add onto this that there's only 1 HART base in the whole region, that puts it right on the far edge of my current playing area, then I'm usually left waiting around for up to 45 Mins for a PRV & SRV to arrive.
IRL you'd be very unlikely to have as many large incidents at the same time as you get in the game.
But I guess it adds to the strategy & planning side of the game.