Well now I honestly just think you're making stuff up since *wave control* Doesn't mean anything.
How else do you roam without losing your tower?
there's shit like freezing, slow/fast pushing, wave denial, etc. etc. that are all parts of wave control. let me give you a real world example
let's say i'm playing leblanc. i just pushed my opponent out of lane without using my ult, so i want to roam. the wave is even and newly arriving, as the previous creep wave was destroyed in the fight, but i want to miss as few creep as possible when i roam. in this case, i would e one caster minion, q another, auto the middle one, and W the back line. this should destroy the back 3 cs. at this point, I leave to another lane
what this does is create pressure. the 3 melee minions will hold the wave back long enough for my opponent and the enemy jungler to make a decision. they can either try to match and/or counter my roam(which might be difficult if they have no vision), or they can lose the gold/exp to turret when I could be backing as far as they know. the timing window created by leaving the 3 melee minions means that, while i'm sacrificing 3 cs, the enemy team has to either get the cs hitting their turret OR give up potential pressure.
what would happen a lot in silver is that the enemy would just afk back to mid lane to catch the farm. if you successfully roam in this period, then you've basically guaranteed that at least the mid laner can't counter-gank or follow you. so basically, if you get anything out of that gank, it cost you 3 cs to do so. it's also important to keep in mind that even if no one dies in your roam, you could be gaining cs for your teammates too. if mid gives up 3 cs to get their adc 10 cs safely, that's a pretty good exchange of resources.
alternatively, you could just watch that guy's videos b/c he explains this shit a lot better than i can. or you could just continue to think that "wave control" is a made up thing by high elo players to keep the silver man down.
:munch:
i lolled irl at this a lot more than i should have