Blocks deprecated with the TF Plugin Framework?

Hi there,

I’m developing a new TF provider, and in the Schemas documentation I didn’t find a way to define a block like this:

data "myprovider_foo" "example" {
  foo {
    a = "one"
    b = "two"
  }
} 

The only documentation I found for Blocks is in the Migrating from SDK - Blocks, but then, I cannot define a nested Map like this:

data "myprovider_foo" "example" {
  foo {
    alpha = {
      a = "one"
      b = "two"
    }
    beta = {
      a = "three"
      b = "four"
    }
    ...
  }
} 

The only working solution I found is this:

func (d *MyDataSource) GetSchema(ctx context.Context) (tfsdk.Schema, diag.Diagnostics) {
	return tfsdk.Schema{
		Attributes: map[string]tfsdk.Attribute{
			"foo": {
				Optional:            true,
				Attributes: tfsdk.MapNestedAttributes(map[string]tfsdk.Attribute{
					"a": {
						Type:     types.StringType,
						Optional: true,
					},
					"b": {
						Type:     types.StringType,
						Optional: true,
					},
				}),
			},
		},
...

and to use it:

data "myprovider_foo" "example" {
  foo = {  <-- REQUIRES an `=` character
    alpha = {
      a = "one"
      b = "two"
    }
    beta = {
      a = "three"
      b = "four"
    }
    ...
  }
} 

Question: Is the Block deprecated with the TF Plugin Framework, and for new TF providers, should we favor more tfsdk.MapNestedAttributes() instead?