I agree, as someone who saw reddit evolve from r/reddit.com to what it is today, it took about 4 years for them to really get to peak old reddit with the introduction of multireddits. Other than that most of the development has been in the third party apps, and really much of that development has been updating the apps to match the evolving OS design language rather than new reddit API endpoints. But we now have the advantage of having a minimum viable product and people with years of experience building and moderating communities.
I agree, as someone who saw reddit evolve from r/reddit.com to what it is today, it took about 4 years for them to really get to peak old reddit with the introduction of multireddits. Other than that most of the development has been in the third party apps, and really much of that development has been updating the apps to match the evolving OS design language rather than new reddit API endpoints. But we now have the advantage of having a minimum viable product and people with years of experience building and moderating communities.