There are no real SEO penalties, but as with any web property, you have to do the work to get all the SEO working as you want.
As far as benefits for developers, give me an open source tool any day that I can improve on, extend, or mess up with sketchy coding. These tools are meant for consumers to build their own sites for the most part. They represent the initial commodification of "get a website". They are more difficult and/or expensive to extend than a tool like WordPress, Laravel, Hugo, etc. And they are walled gardens, which means they are difficult to migrate away from.
As a SWE who moved to Agile Coach, it can be a fun challenge, but since you aren't actually doing scrum, you shouldn't worry about actually following the full process and instead should think about essentially being a product owner (no matter the title) - the interface between the development team and the customer. You'll want to watch out for you being held responsible for the team's performance instead of the ICs on the team. So some CYA could be in order, even if that's just clearly defining your roles and deliverables with management before taking it on.
As another commenter noted, you should be able to lean on your team for help with things like estimation and tracking, but that really depends on your organization's existing process.
Other than that, lovely idea and implementation!
The home page offers minimal value in understanding the concept. If you had a text section just below your hero that explained why/how you are marketing coffee as a "supplement", it would be extremely helpful. Something light-hearted that hammers home the point you are treating coffee as a supplement. You already lean into it by having supplement info sheets on the product pages, so perhaps below the explanation, you could put some CTAs to drive people to click on/order the coffee. Like, "Looking for sweet flavor with an intense aroma? Try X. Looking for a more traditional flavor? Try Y".
Obviously these are quick off-the-cuff suggestions, but the meta-problem I'm looking at is helping a new visitor understand your branding and aid them to find what looks like really good coffee by easing them into the "supplement" branding concept.
If you're targeting gamers, to me nothing about the site indicated gamer-related or even gamer-adjacent except for the label font. The pictures are all hoodied zoomers. If you want to go after the gamer supplement market, I think you might need a redesign that focuses even harder on the supplement concept (e.g. Kill Enemies Faster! Shave Seconds off your Speedrun!), as the current one feels like it's targeted at higher-end urban professionals and influencers.
I hope any of this is helpful. The social proof makes the product sounds fantastic and I'd love to try it.