And in many places that's still the case, and is actually useful and important to get local issues surfaced properly.
For states with heavily gerrymandered districts, though, I agree: might as well just do away with districts and have the entire state vote for their entire roster of representatives.
If not ranked choice voting, how would this even work?
That said, ranked-choice voting in large multi-member districts is certainly possible: It is usual to require voters to rank only as many candidates as there are vacancies, though they can number more if they wish to (consequently they don't need to understand the detailed policy positions of the minor candidates that have no realistic chance of election). Voters in such systems tend to firstly order the parties based on the policy positions of those parties, then order the candidates within those parties if they have a strong opinion of the relative merits of those candidates.
Here's an example of a media summary of the candidates running in such an election: https://www.abc.net.au/news/2019-05-17/federal-election-2019...
For example, in my district (Brownsville in Brooklyn), we have an almost tragically poorly-ranked school system, due largely to bad funding and high crime rates in the area. I don't expect someone from Midtown Manhattan to care a whole lot about these specific problems (I know I certainly didn't when I lived in Washington Heights).
In an ideal world I guess I'd agree, everyone would care about everything at the exact appropriate weight, but that's not the world we live in. Certain problems will go ignored if we don't have fairly-granular representation for an area.
You do make a valid point that many issues are local and that could be lost in a system where the party is focused at the state level instead of the local level. Proportional representation systems are prone to having this issue for example.
That's just one example, but it's not as simple as "give a certain amount of money per kid to the schools", and saying this is reductionist.
I don't know what the difference would really be in practice, although I think the other comments in this thread about lack of proportional representation would probably apply. I think it sort of comes down to how much worse you think Tyranny of the Majority is than what we have currently (or if you want an actual proportional representation system instead).