This is definitely true, but it's still simple to do simple stuff like make a bot or embed a custom naïve feed in your HTML website, or make a relay browser client like https://jumble.social/, I don't know, stuff like that. But still it's nice that it's possible to make a shitty client very fast and grow from there.
I also think that making a Twitter-like client is the hardest task, while a NIP-29 client is much easier -- but still, making it really good, anything, will require a ton of work, even a stupid note-taking app is very hard to do well.