WASHINGTON—As President Joe Biden’s first 100 days come to a close this week, a number of key policy positions and contentious issues remain “under review,” to use the White House’s terminology. Many relate to China, the United States’ strategic competitor, a rivalry that Biden has starkly defined, most recently in a speech to Congress on Wednesday, as a struggle between democracy and autocracy for control of the global economy in the 21st century. The Biden administration has begun to flesh out an overarching strategy to compete with China that relies on renewing relations with partners like India and allies like Japan and South Korea, and heavy domestic investment. But critics say slow reviews of specific policies could cost U.S. companies and the economy. After Biden’s speech, Republican Senator Mitt Romney told reporters, “I don’t believe we yet have as a nation a comprehensive strategy to deal with a China intent …