That's because while some sagas have a very strong final ability, many dish out incremental value over time, and skipping right to the end of a saga means you miss out on lots of useful effects
"A Spell Counter is a type of counter that is put on cards that use Spell Counters"

We developed a workflow that asked concept artists and card artists to pull hallmark character designs from Yoshitaka Amanos original (and legendary) concept art, the original FFVI sprites, and the FFVI Pixel Remaster character portraits, to synthesize the most consistent elements of each characters design into something new. We also encouraged our artists to punch up finer details and bsexplore elements where they thought they could push (fabric, patterns, textures, etc.) Then, we would meet with the Final Fantasy VI review team, and they would give us feedback on what core elements they wanted to preserve and what new elements they were excited about. "It's our hope that the [FF6] character designs should feel like how you 'remember' them..." So they had the four games decided, but when it comes to Commander, thats only half the equation WOTC also needed to figure out which characters would lead each deck
Gimme a sec before the next card
All of these questions should factor into your decision, and luckily youre not alone in trying to figure all that out