I don't know Ramda. And honestly, some of that code looks pretty obtuse. But if your lead developer and team majority want to run their team this way, then you need to learn Ramda. From their perspective, they are using the most elegant, readable, and/or maintainable solution they know about. They might be wrong, but your job isn't to prove them wrong. Your job is to be a team player and ship the product. Resistance to Ramda may result in you being labeled a Blub Programmer. In this case, a programmer who is skeptical of more powerful languages or tools. You might acquire a reputation on the team as the guy who writes "basic code" or the guy who isn't a team player. Both of those are bad. Your options are basically: learn Ramda, show them something better, do nothing and hope relations don't sour, or start searching for a new team.
If you choose to show them something better, you need to be willing to accept if the team doesn't find your replacement better. You need to respect that the cost of switching might be too high. You need to really understand Ramda and demonstrate that understanding of Ramda so you can give a competent explanation for why your solution is better. If they're not convinced you understand Ramda, you'll solidify your reputation as the Blub Programmer or you'll look like you're wasting time Bikeshedding or arguing against things they think are obviously non-negotiable. I don't recommend attempting to show them something better unless you have a really solid case.
Free Online Book that covers JavaScript and Ramda. Don't worry if you don't understand some of the later parts anyone who does is probably pretending anyways: github.com/MostlyAdequate/mostly-adequate-guide
If your team is still using PHP, they might be interested in the Non-standard PHP library: github.com/ihor/Nspl
What if the team majority is not on board with Ramda? What if it's one or two developers and the rest just tolerate it? My answer does not cover that scenario, but remember first and foremost that you must be a team player and you need to ship the product.