It's a worthwhile comparison to make. You are focusing on "Bitcoin dominance" but you are ignoring that Litecoin massively outperformed both BTC and the entire altcoin market during it's pre-halving pump this year. That's a pretty strong indication that halving-driven demand is a real thing. That spells real implications for the BTC market as we approach the 2020 halving.
I will never agree that comparisons of BTC with LTC or any other altcoin should be done, and especially that we should be afraid that BTC halving will have zero effect like LTC halving (long term). I know there are those who still think the time will come for altcoins, but I think that 2018/2019 made many people aware that altcoins (LTC included) are not a smart investment option. LTC is starting this year with $30, and it ends it just above $40, but it is true that at one point it hit almost $120.
What is different with BTC and LTC halving is time period after the price is starting to rise, and if BTC is stay on this price level one year from now, many will say that halving is have zero effect. I think that 2021 is a year of big events, but that's just my personal opinion.