Apparently French people are going to give a legislative majority to ANYONE who's been elected President, no matter the circumstances.
Usually, that provides somewhat of an issue imo because that gives a president, no matter how bad later on, the majority to do what he or she wants. However, now it seems to be different since a good part of REM candidates are still part of different parties and could just split off and join their other parties' groups in the National Assembly if things go sideways for Macron.
I think they should have their legislative elections at different times, though, no a month after the presidential election.
That would give them the same gridlock problems as the US.