Reasoning
When weighting sources by confidence and treating each domain as a single opinion, several credible reviews explicitly label Bitrix24's UI as difficult or not beginner-friendly (Trustpilot, PCMag, The Digital Project Manager, Software Advice) and multiple others mention a learning curve or navigation challenges. While some sources note ease, the stronger, higher-confidence signals collectively point toward lower UI ease. Therefore, the consensus is best represented by the 'difficult' end of the scale.