I agree with most of the other replies.
I use the Practice to try to improve the setups because it's a lot easier to get back to tweaking it rather than jumping into a race and having to abandon, reload, try, repeat....
Also great if I've already got a comfortable setup and want to improve timings based on driving line, braking points, entry/exits.
If you're not using it and just dive-bombing into the race, you're missing out on quite a lot. But it's your time
I use the Practice to try to improve the setups because it's a lot easier to get back to tweaking it rather than jumping into a race and having to abandon, reload, try, repeat....
Also great if I've already got a comfortable setup and want to improve timings based on driving line, braking points, entry/exits.
If you're not using it and just dive-bombing into the race, you're missing out on quite a lot. But it's your time