I don't see Ash getting another electric type it would remove Pikachus uniqueness. Also I don't see what makes a Pokémon suit Ash I don't think there is a rule that makes Ash certain Pokémon, only the desire of he getting.How is it "unfair", first of all. Types are types. It's obvious none of the Grass types in Kalos suited Ash's personality if he hadn't obtained one. That's really all I have to say on this matter. As for how I felt about it, I didn't really care. I thought it was interesting that Ash didn't capture a Grass-type this time around, it made his team focus very different. In the very beginning we all assumed that he would capture Chespin, but looking back, Chespin never really suited his character to start with.
I would like this trend to continue where Ash does not get the Grass type. There are many other types for Ash to play around with that he has not used yet. I know it's wishful thinking, but another Electric type alongside Pikachu is something I want, tbh. Maybe he can finally also get a Steel type.
The only other Grass types in Kalos to begin with besides the Chespin line were the Skiddo line, Phantump line and the Pumpkaboo line anyway. There are many other Pokemon that suited him better.
Alexa also owned a Noivern but I would have preferred Phantump.I found it weird at first to see Ash not get a single Grass-type in the region, but then again I likely blamed it on the fact 6th Gen introduced way too few Pokemon to the point his team didn't have many options (at least in the writers' eyes). Jessie and Alexa already owned Gourgeist and Gogoat, so it kinda ruled them out plus the writers making Chespin a comedy relief also kept it out of the Ash race, since I suspected they wanted to make the XY saga and Ash's Kalos team "more serious" and I guess that played a factor into why the series is getting received well, at least in the US since this ended up being the worst-rated saga in Japan.
I hope Ash catches a Grass-type again for his Alola team (I think Rowlet) and maybe we'll see how different his team can become or not.