Having done a major migration with Stripe, at a startup, I disagree.

They have lots of products, but you don't need most of them and can ignore them. What's left is, in my experience, the correct amount of complexity. We looked at Braintree, and it was just missing things that we were legally required to support, we looked at Judopay and it was... lacking (a nearby founder describe Judopay as treating payments like a hobby).

If your business is just ecommerce and you can use Shopify instead, sure, do that. If you just need to take dumb payments, just use Stripe Checkout. But if you need any control over your payments, Stripe is the only good option for startups. As you grow it becomes easier to justify more complex integrations such as Adyen, Klarna, etc, but Stripe is definitely the best starting place I've seen.