Is it like driving without force feedback wheel? Or bass shakers? (The only devices i own that help a lot with immersion )
Once you've tried, could you race without having them?
Or is it really a must have if one can afford them?
What about traction loss? Is it as indispensable as pitch, roll, heave?
Let's first realize that all the technologies that we use to enjoy this sport virtually are 1st world luxuries.
Secondly, I would submit that most people drive visually, so visuals are 80% of the experience/immersion if you will. Again just my opinion, many would disagree. Haptics and tactile feedback are often also over used marketing words. A FFB wheel is also haptic and tactile.
So could you race without a wheel on a controller? Ofcourse, sure! I did it for many years and still raced cars and enjoyed both. Is it really a must have? No, motion is NOT a must have I would argue, you can have as much fun with a controller, old wheel etc... the true fun is in the content, the competitive team play, the comradery or the few moments that we interact in a virtual environment and have fun.
Now the details. Traction loss is one of those "effects" or layers of motion that in my opinion is really hard to reproduce and hence why people often use "fake" effects of roll to reproduce or to communicate vehicle yaw/sway. Proper loss of traction systems would have to be bolted to the floor, and have very large motors/torque to ensure that the sway/yaw would not get washed out after several side to side lateral motions (like in rally and/or rallyX). Furthermore the games would need to be synced with the lateral motion, otherwise you slide inside the cockpit, while the car on the screen stays still or fix mount the screens to the cockpit. Lots of total "integration" is required to make this truly believable. But in the end, I believe that a sudden sharp acceleration, in physics called a jerk moment, is sufficient in communicating to the driver, in time, what is happening and how they should in turn react/respond. Most people can fill in the missing gaps where the motion system is lacking.
But Yes, motion systems are immersive if done well and integrated well mechanically, electrically and algorithmically. It's a very rewarding and immersive experience.
One good way to test motion immersion is to do 20-30 minutes in a motion sim so that your mind gets used to it. And then turn it off for the next 5 minutes. You will see how quickly we change our levels of 'acceptable' immersion and how much you will miss a fine tuned motion system. In essence it fills in that last 20%, and the visuals are close to 80%.
Again this is all my professional opinion, after being in the industry for 20+ years. In the end I've learned that there are no perfect solutions to motion, just compromises we have to make based on product limitations, environment limitations, software limitations or budget.
Enjoy!