How are you using Mongo? What version of the server and driver are you using?

I work on the Node driver, and I test and work with all supported server and driver versions

This feature is client-side only, probably not something we'd backport so only relevant to 6.x drivers.

What is the feature/improvement you would like?

Add an alternative `withTransaction` API that wouldn't require users to pass a session in to each operation.  Maybe something like this:

client.withTransaction2(async (client: TransactionMongoClient) => {
  // client is a specialized client that stores the current session,
  // so each operation can obtain the session from the client/db/collection
  // instead of passing it explicitly into the API
  await client.db('foo').collection('bar').insertOne({});
});

What use case would this feature/improvement enable?

This would simplify our convenient transactions API for users.