Why deprecate experimental_standaloneMiddleware?

I am reading https://trpc.io/docs/server/middlewares#experimental-standalone-middlewares, but it's still not clear to me why experimental_standaloneMiddleware was deprecated. It says we can use .concat() to use "standalone" middlewares. However, I don't see how they are related exactly?
The example shows we can use a plugin. This would take in a new procedure to do concating of procedures.
But this is not exactly what I want. In my code I have this:

const todoAppInstalledMiddleware experimental_standaloneMiddleware<{
    ctx: TProtectedProcedureContext;
  }>().create(async ({ ctx, next }) => {
    const foundPermission = await ctx.prisma.teamAppRole.findFirst({
      where: {
        AppPermissions: {
          some: {
            id: "234234324-my-todo-app-id-here-yay",
          },
        },
        Team: {
          id: ctx.session.user.activeTeamId,
        },
        Users: {
          some: {
            id: ctx.session.user.id,
          },
        },
      },
      select: { id: true },
    });

    if (!foundPermission)
      throw new TRPCError({
        code: "UNAUTHORIZED",
        message: `You don't have permission to do this. Contact an administrator if you believe it is an error.`,
      });

    return next({ ctx });
  });

const todoAppInstalledMiddleware experimental_standaloneMiddleware<{
    ctx: TProtectedProcedureContext;
  }>().create(async ({ ctx, next }) => {
    const foundPermission = await ctx.prisma.teamAppRole.findFirst({
      where: {
        AppPermissions: {
          some: {
            id: "234234324-my-todo-app-id-here-yay",
          },
        },
        Team: {
          id: ctx.session.user.activeTeamId,
        },
        Users: {
          some: {
            id: ctx.session.user.id,
          },
        },
      },
      select: { id: true },
    });

    if (!foundPermission)
      throw new TRPCError({
        code: "UNAUTHORIZED",
        message: `You don't have permission to do this. Contact an administrator if you believe it is an error.`,
      });

    return next({ ctx });
  });

const todoAppInstalledMiddleware experimental_standaloneMiddleware<{
    ctx: TProtectedProcedureContext;
  }>().create(async ({ ctx, next }) => {
    const foundPermission = await ctx.prisma.teamAppRole.findFirst({
      where: {
        AppPermissions: {
          some: {
            id: "234234324-my-todo-app-id-here-yay",
          },
        },
        Team: {
          id: ctx.session.user.activeTeamId,
        },
        Users: {
          some: {
            id: ctx.session.user.id,
          },
        },
      },
      select: { id: true },
    });

    if (!foundPermission)
      throw new TRPCError({
        code: "UNAUTHORIZED",
        message: `You don't have permission to do this. Contact an administrator if you believe it is an error.`,
      });

    return next({ ctx });
  });

const todoAppInstalledMiddleware experimental_standaloneMiddleware<{
    ctx: TProtectedProcedureContext;
  }>().create(async ({ ctx, next }) => {
    const foundPermission = await ctx.prisma.teamAppRole.findFirst({
      where: {
        AppPermissions: {
          some: {
            id: "234234324-my-todo-app-id-here-yay",
          },
        },
        Team: {
          id: ctx.session.user.activeTeamId,
        },
        Users: {
          some: {
            id: ctx.session.user.id,
          },
        },
      },
      select: { id: true },
    });

    if (!foundPermission)
      throw new TRPCError({
        code: "UNAUTHORIZED",
        message: `You don't have permission to do this. Contact an administrator if you believe it is an error.`,
      });

    return next({ ctx });
  });

Doing this via concat() feels unnatural. I just want to define a middleware that I can use in multiple procedures where my session is not null (protected context). What is the recommended way of doing this?

Why deprecate experimental_standaloneMiddleware?

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