Roulette is a mechanical device. Whatever is mechanical is not capable to give you real randomness of events. It will always have some kind of order. Well, not always, but most times. Or just many times.
Remember, that is what British and Polish intelligence used when cracked German Enigma. When operators used it, they did not use it really randomly, they had some patterns repeated over and over again. Because it is very hard for either human or mechanical device to be always random. And there you had both at work, just like at the roulette wheel in a casino. So they tracked those patterns thoroughly. And they were never able to crack the machine completely, they just cracked lots of info, but not all. Just like in roulette, even if u can win, it is impossible to do all the time, each time for thousands of spins. If you try u will always lose.
Computers are different story though. Computer can give u anything u want if programmed properly for that goal. So here goes an answer to your question why RNG and a physical wheel are different.
So if we arrive at the table and start to record the spins we/you will see 1 number of the 37numbers took 1 spin to come in. The next number of the 36 left could come in, in 1 spin or even take 2 spins maybe even 5 spins, but eventually it comes in.So 2 numbers have hit. So of the 35 left it takes X amount of spins for the 3rd to hit. Of the 34 left it take X amount of spins for the 4th number to be hit.
Okay lets move on lets say we've seen all 37 numbers have hit and each of the remaining numbers after the 1st number hit have taken x amount of spins to come in, lets assume all 37 were hit in 155 spins, thats 1 piece of data recorded.
Now do the same over and over again like the British and polish intelligence service did, you'd have a large data base that would give you the longest amount of spins for each of the remaing unhit numbers take to hit.
You could ask the data base what is the avg say for the19 numbers not to have hit yet, to hit.Of your thousands of recorded spins the registry might be 3,1,4,11,8,5,3,3,1,1,4,9,9,spins so the avg for this small example 4.7692, if we round up avg 5 spins, the question is how many times you can bet 19 numbers with your Bank roll, if the longest 19 numbers took to hit, is say 11 spins, its avg to come in is 5 spins, would you wait 6 spins,if the 19 have still not hit would you now bet,or wait 1 more spin to feel confident that the avg that has not changed for thousands of recorded games will make you a winner.
Oh yes i changed that sentence to red.
Its what i've done recorded how long the remaining unhit numbers take to come in, Look at Winkels GUT it uses the 37 numbers you see the numbers left to hit of those to be hit how many times do those that already hit before those to be hit,hit. Its the same for KTF ( keep the Faith) which i use with Winkels Gut.
My data is all rng, On 21/7/15 went to aspers at milton keynes one of my rare visits to a b+m used Winkels method with KTF won £26.00 for .25p units, stopped 41 spins, recorded next 7 spins waiting for the rest fo the party to finish plastering chips every where.
If you look in KTF column the worst bet is betting for the remaing 24 numbers, in the UK bookies it still would have won as can bet 3 times, same for the remaining 21 numbers possible bet in bookies is 4 spins and obliged, reference the 2 methods and your on a winner.
RNG every time