Fred
Veteran
I do 6x6 in 4 minutes and 7x7 in 6 minutes, and here's my take on differences between 6x6 and 7x7. I find 6x6 centers to have more room for creativity. I often do the standard bars, but I'll also do various kinds of blocks. On 7x7, you don't have to solve the central bar first, but you do have to solve it before too long or you'll have too many trapped pieces and lose time taking them out. I also find blocks harder to keep track of on 7x7 and stick with bars usually.
Then for edges, both of them will often have some lucky cases with a couple edge pieces already paired up or very easily paired up, but more so on 7x7. And for last four edges, I usually take the strategy of pairing up the central-most edges to reduce to 5x5 L4E, but on 7x7 I sometimes have to do a L2E parity alg to achieve this, which means I sometimes do two L2E algs. There are some 7x7-specific L2E algs to handle inner and outer wings at the same time, but I haven't learned any of those.
My biggest argument to remove 7x7 is that many competitions have pretty strict time limits/cutoffs, making the event very inaccessible for beginner big cube enthusiasts. But the obvious better solution is to have more lenient time limits, like this comp, which even allowed 10+ minute times!
Then for edges, both of them will often have some lucky cases with a couple edge pieces already paired up or very easily paired up, but more so on 7x7. And for last four edges, I usually take the strategy of pairing up the central-most edges to reduce to 5x5 L4E, but on 7x7 I sometimes have to do a L2E parity alg to achieve this, which means I sometimes do two L2E algs. There are some 7x7-specific L2E algs to handle inner and outer wings at the same time, but I haven't learned any of those.
My biggest argument to remove 7x7 is that many competitions have pretty strict time limits/cutoffs, making the event very inaccessible for beginner big cube enthusiasts. But the obvious better solution is to have more lenient time limits, like this comp, which even allowed 10+ minute times!