Why I don't like loaders

// как это надо делать:

Single.fromCallable(() -> {
        DialogsTable.getDialogByOpponentId(App.newInstance().getManagers().get(0).getManagerId());
    })
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe((dialog) -> {
        MessagesTable.createChangeStatusMessage(dialog.getDialogId(), statusName, endDate);
    });

// как это делают они:

    @Override
    public void onResume() {
        super.onResume();
        //.. я убрал лишнее тут
        getLoaderManager().restartLoader(Constants.CHANGE_STATUS_FRAGMENT_LOADER, null, loaderCallbacks);
    }

    @Override
    public void onPause() {
        super.onPause();
        getLoaderManager().destroyLoader(Constants.CHANGE_STATUS_FRAGMENT_LOADER);
    }

    private final LoaderManager.LoaderCallbacks<Cursor> loaderCallbacks = new LoaderManager.LoaderCallbacks<Cursor>() {
        @Override
        public Loader<Cursor> onCreateLoader(int id, Bundle args) {

            Uri uri = null;
            String selection = null;
            String[] selectionArgs = new String[0];

            switch (id) {
                case Constants.CHANGE_STATUS_FRAGMENT_LOADER:
                    uri = ContentProvider.createUri(DialogsTable.class, null);
                    selection = DialogsTable.DIALOG_ID + "=?";
                    selectionArgs = new String[]{getDialogId()};
                    break;
            }

            return new CursorLoader(getActivity(), uri, null, selection, selectionArgs, null);
        }

        @Override
        public void onLoadFinished(Loader<Cursor> loader, final Cursor cursor) {

            int id = loader.getId();

            if (mProgressDialog != null) {
                mProgressDialog.dismiss();
            }

            switch (id) {
                case Constants.CHANGE_STATUS_FRAGMENT_LOADER:
                    if (cursor.moveToFirst()) {

                        endDate = cursor.getLong(cursor.getColumnIndex(DialogsTable.DURATION));
                        originalEstimateDate = cursor.getLong(cursor.getColumnIndex(DialogsTable.DURATION));

                        originalEstimate.setText(DialogsTable.getEndDateInUsaFormat(cursor));
                        datePickerText.setText(DialogsTable.getEndDateInUsaFormat(cursor));

                        final int companyId = DialogsTable.getCompanyId(cursor);
                        Thread thread = new Thread(new Runnable() {
                            @Override
                            public void run() {
                                statuses = OrderStatusesTable.getStatusesByCompanyId(companyId);
                            }
                        });
                        thread.start();

                        try {
                            thread.join();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }

                        final int statusId = cursor.getInt(cursor.getColumnIndex(DialogsTable.ORDER_STATUS));
                        selectedOrderStatus = getStatusById(statusId);
                        initialOrderStatus = selectedOrderStatus;

                        ArrayAdapter<CompanyStatus> spinnerArrayAdapter = new ArrayAdapter<>(getActivity(),   R.layout.simple_spinner_item, statuses);
                        spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        statusPicker.setAdapter(spinnerArrayAdapter);
                        statusPicker.setSelection(statuses.indexOf(selectedOrderStatus));
                    }

                    getLoaderManager().destroyLoader(Constants.CHANGE_STATUS_FRAGMENT_LOADER);
                    break;
            }
        }

        @Override
        public void onLoaderReset(Loader<Cursor> loader) {

        }
    };