Is it realistic for almost every criminal to have a super car and 1200cc track bike and riding around on dirtbikes etc all the time?
Is it realistic for criminals to roll around with an automatic rifle all the time?
Everyone in the game runs at the same speed so you cannot catch someone unless you taze them or block them with cars (usually this ends up with the suspect getting ran over because of desync)
Is it realistic for suspects to drive at full speed everywhere without fear for their own lives?
I think you need to look at WHY LEO on this server has to use equipment the way they do. SD and PD are reactionary factions. They adjust their practices based off what criminals are doing. If criminals were using a car that some random criminal would use IRL (a regular sedan, maybe a muscle car occasionally), then SD and PD wouldn't have to have the bikes and cars they do. Even though SD and PD has these sports cars, sports bikes, off road bikes in the garage, they are all locked behind rank authority. For example, only supervisors+ can use a jugular. Only a specific deputy/officer rank can use sports bikes and BF400s. The same goes for automatic weapons. SD and PD wouldn't have to roll around with heavy weaponry on their backs if criminals didn't have such easy access to them at very cheap prices. Additionally, automatic weapons are locked behind rank, and they are highly limited, at least in SD.