Even with the Riot practice tools or what have you it won't make a large difference in the long run.
we're talking about players that play around 10 hrs a day of solo Q where they do play different champions but yet it doesn't translate to the LCS, practice with weird picks in their scrims to fool their scrim partners so they don't get a 100% read on their true picks etc. So they can/do play different champions but if LCK doesn't play certain champions NA won't either because " Monkey see, Monkey do" syndrome that NA has.
I look at some of these lower tier teams(NV-EF) and it surprised me that they didn't do anything unorthodox or different in their picks when the fans and they must of have known that they would be around the bottom tier in the regular season.
Origen did great at Worlds because they did things differently - the Anivia TP was something that caught on especially the TP mid and they were successful because of it. Albus Nux Luna did great because they didn't do the same stick each game. They didn't do what the Koreans did or what NA does which is " copy paste what LCK does" and they beat NA(CLG) 2-0 at Worlds, beat a LCK team(ROX), EU(G2) and eventually made it out of Groups.
A Longer season(combined Spring/Summer Split) into 1 split could see different champions, styles and ways for teams to play and win.
- We've seen C9 switch Impact out for Ray multiple times through out the split.
If the season was longer we could see more and more teams switch out and use their subs in games which might help champion diversity because we're talking about a total of 72-108 potential games the pros will have to play through out the season, which in hand could lead to different champions in the long run.
( Sub out Bjergsen who plays the meta picks) and sub in a different player to only use the same Meta picks ?
No, it gives Bjergsen a rest in a 108 games total which drains players, so it gives them a break as well as trying something new from a different player.
C9 - had their reasons to keep using Ray because Ray was very aggressive and they wanted teams to practice for Impact- who has more of a team first mentality and Ray who's more aggressive.
If TSM was up 13-0 and the 2nd place team C9 is around 9-4 in the standings, TSM has some room to use different champions, subs to use them or the core players. Why play the same champions whenever you have a 4 game series lead, try something NEW and see if it sticks whenever you have a comfy lead, you have nothing to lose, you're in the lead by 4 game series, and it elevates your gameplay trying out something new, as well considering the longer split ( 36 game series) you have plenty of time to go back to the regular "meta" picks.
18 game series even with 3 games in each series - is still a toss up because even if a team is 0-7 in their minds " we can still make it to playoffs, we just have to try harder, Keep playing the same ol' champions".
I could be wrong about the longer season could help champion diversity but it's a itchy subject because it's still true about the " There will ALWAYS be better champions even when all are viable because of how certain champions can form a great team comp". As well as NA is a follower they only use/play champions that the LCK plays.