How does "best fit" is even assessed? Genuinely curious.
That is why I mean by "case by case", the secret thing that they don't tell you about game dev is that it is all about trade-offs and resources. It takes a lot of work (not just from me, remember everything needs to go through QA too) to make any sort of change ESPECIALLY if art is involved. So it really comes down to how valuable we feel a particular change will be vs the cost of making that change. Both games are different and have different problems we are trying to solve so "best fit" really comes down to a few things, and often that is what problems we are trying to solve.
In the Sona example, we are not seeing a problem with Sona being a powerful solo lane champion, so it would be a rather high-cost change with no clear goal in mind.
So generally an update needs to be solving some sort of problem, and the scale of that problem. Sometimes we will have a change in mind that is low cost but has a lot of potential upsides (Ahri update), and we are able to do it.
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