That's true, although from my experience is VSCode one of the very few electron apps that still start within fractions of a second, even with a handful of extensions. On my machine VSCode (with 38 extensions) is ready to use before the GNOME launch animation has finished.
That said, things are probably a bit different on machines with limited RAM.
You can also use it to create your own "algorithm".
With Reddit I've always subscribed to each subreddit individually, sometimes adding filters like "/hot/?limit=10", which only shows posts that reach the Top 10 posts in /hot. That way I wouldn't miss any post in niche subs while being able to individually scale the amount of posts I get shown from the bigger subs.
You can do the same here on Lemmy, although I still haven't felt the need to configure it, since staying on top of /new is still doable.