It's basically meaningless. You can say it just to say it and it's a pretty popular line with casuals but it doesn't really explain anything. What if Blanka comes in and Blanka is horrid? What change would they make to "buff the weak"? Roll cancel electricity (CVS2 reference)? What if Dhalsim is in the game and Dhalsim loses a few matches extremely terribly that make him basically unviable (basically like SF4 except Sim loses all matchups in that game lol)? What would they do to help him there?
Ok I see what you are saying. Yeah it could be that. But I kinda see that as being sayable about anything. I just look at it kinda like:
"We will try to buff lower tier characters rather than just knee jerk nerf strong characters" I see it in their wording. They used weasel words like try... Which in this instance actually gives me hope.
It seems that they know that they won't be able to always use this "buff the weak instead of nerfing the strong"
Previously they have said flat out that they will buff weak characters rather than nerfing strong characters, but in the end that didn't happen in most cases. Like they saw what that would actually entail and decided to just abandon that line of thinking. Whereas now they seem to know what they mean when they say this...
And though your questions are rhetorical... Why not take a stab at them:
If blank a is weak there are a number of things they can do to make him stronger. the most obvious is to just make his moves all do a bit more damage... Like anywhere from a 10% to 50% damage increase depending on how much sucktitude he is.
And going on, they could also, (or only) buff his frames to make things neutral or safe on block/hit or they could buff the startup frames of some of his key moves. They could make lp ball -1 on block and recover instantly on wiff after it recovers. They could give him an airdash after his non invincible upballs and not have it on his invincible upballs. Their are literally many many things they could do. They could buff electricity by giving it a command motion and making it do great chip and making it plus on block...
They could make his ground dash become attack cancelable which when combined with his ability to cancel his dash from normals would give him CRAZY pressure up close... Would almost certainly be overpowered, but could compensate in other ways.
Bla bla... You get the point. There really isn't any bad design for fighters in most fighting games, only badly implemented designs. When birdie was rumored to be in, people lost their shit because they thought that he would be fucking useless like always. But, capcom actually made him decent and now people love birdie. Birdies design was never bad. Capcoms old implementation of his design is what was horrible. The same as their design for sf4 deejay and others.
So, when I hear them say that they are going to really try to give everyone good tools and make everyone good... Idk, I just hear good things unlike before when Ono literally said that they design certain characters to be slightly weaker than others to increase "hype" when said character wins. Just glad they are looking to leave that philosophy behind.