Intricate gameplay details

The most common of all player reviews of ZERO HOUR is to rate it as the most realistic tactical counter-terrorism game, with the main comparison being R6.

ZERO HOUR has more details compared to R6, such as electric switches on every map
This detail means that lighting is a very important factor in ZERO HOUR's gameplay. Because the light can be altered, this leads to a range of gameplay elements, such as night vision cameras for the defending side and tactical torches for the attacking side, and perhaps the inclusion of equipment such as night vision devices in the future.

Apart from the lights, the props in ZERO HOUR are shared by the whole team
The camera cannot mark the location of enemies, and opening doors requires two steps, the first being half-open and the second being fully open. These details make ZERO HOUR more realistic than R6, but perhaps less so in terms of gameplay. In the current gaming world, the realism of the game seems to be the most important element for gamers.

But for FPS games, realism is directly proportional to the hardcore level of the game
In the case of Armed Assault 3, there are a number of modules that are made to enhance the realism of the game in order to achieve a higher level of realism. Once you install these modules, you'll find that using a sniper rifle requires adjusting the closeness based on distance, and is required to calculate wind and humidity based on a ballistic solver. I'm not sure how many players will use these game designs correctly, but I'm afraid it's hard enough just to understand the terminology. The damage system in Escape from Tarkov, for example, has different effects on different parts of the body, and hand injuries on the left and right arms have different effects.

And with these highly realistic elements comes more complex gameplay, and complex gameplay takes a long time to get up to speed
These details also require more play time. This is why a game of ZERO HOUR must take longer than R6, which may seem like more fun the longer it is played, but it is not.

If it's an FPS with large maps and large battlefields with many players
Battlefield, Call of Duty: Warzone etc., the game length does not affect the gameplay too much, but for CQB games the game time is also an important factor in the gameplay.