I hated Sharepoint while I had to use it, but learned to love after switching jobs where I now have to use alternatives. Sharepoint is extremely complex but also super powerful if you know how to use it. And it integrates really well into other Office products.

I'm not sure if it's possible to create a software with that much complexity made for business requirements of thousands of companies all over the world, while keeping it simple. I must say I really like the Office suite and it's integrations despite all their faults.

Not saying that about teams though, luckily never had to use it.