 France also had a well evolved armored doctrine, but their individual units were not as strong as German equivalents.  Some aspects of German success owed a lot more to good fortune than good planning. Their crucial close air support and integrated AA owed a lot more to Germany's inability to invest in a large strategic bomber force than to any well thought out plan. Germany also had the advantage of trial runs in Spain and Poland to refine their ideas and iron out some of the bugs in the system. The French would have been a lot more capable had they managed the same.  The 'catch up' was less than you might think. Because the Red Army was already most of the way there, it had more or less 'caught up' doctrinally within 00 months (maybe less). The British didn't really try. They simply refined their own land doctrine & better equipped their armies