Not really & you left off a +2 either by accident or.... What I
said was "5 7 [7] 9 10 12 base & add a +1 base or magic item to one of those from your culture along with a +2 one from your background. " I accidentally only listed 5 stats instead of six, maybe throw in an extra 9 or 7 to bring that up to six attrib values & I'll use the 7 for the rest of this post.
Put that into perspective against the default array of 15,14,13,12, 10, 8/
whatever pointbuy where you have stat bonuses of +2, +2, +1, +0,+0, -1 this works out to +1, +0, -1*, -2*, -2*, -3* with your culture including the ability to raise one of those odd numbered penalty atribs by one using the suggested base value or magic item based +1 attrib item & your backgound including a +2 base value or item. If you want to stick that culture item in your primary or secondary stat you could start with +2, +0, -1*, -2*, -3* or +1, +1, -1*, -2*, -2* -3* using the culture item to bump one of those odd number asterisked values by 1.
This allows quite a few things, but the most dramatic change is that there are immediately a lot of subjective ways to allocate your stats & the choice of both primary/secondary
and dump stats will make different characters feel extremely different even within the same class. The room for growth including reasonable early goals like attribute boosting magic items people
care about & are almost certain to not say "well I don't use $stat" or "bob is $class so obviously he should get the item that the gm put in pretty much for bob]". More importantly it
also includes the ability to differentiate a martial with a little casting from a caster with a little martial or a pure martial/pure caster in a balanced manner right out of the gate without needing to do it too heavily because the dump stats now viscerally matter and you can set "do I use dex based finesse weapons, strength based martial weapons, or the int/wis [cantrip] wand weapons of a caster" to something other than a class level thing because those penalties are too big to accomidate something like CoDZilla no matter what abilities your class adds to the mundane staple attack choice you make. If you are building yourself a pure martial/caster your probably going to dump the stats for the other side of that coin. If you want to build a a gish you can & will probably wind up dumping saves so you can bring your secondary (ie dex/con) stats up to snuff or maybe any number of possibilities.