1. Lack of an offline version:

If you need constant access and live in an area with poor connectivity, Notion's online-only setup might be a problem.

2. Minimalist interface:

Notion's sleek design could feel lacking if you prefer interfaces jam-packed with features and visible functionalities all at once.

3. Integration limitations:

Notion is improving, but you might find it lacking if you're after a rich ecosystem of natively integrated apps and services like Airtable offers.

4. Handling large data sets:

Notion has improved, but it might not be the powerhouse you need for massive data handling or complex analysis.

5. Security needs:

Notion's security has improved, but it may not meet the mark for businesses with very specific high-level security demands, such as end-to-end encryption.

6. Specialization vs. flexibility:

While Notion's adaptability is a strength, it may not be the best fit if you need highly specialized, task-specific solutions.

7. Learning curve:

The trade-off for Notion's customization and flexibility is the time spent learning how to use it effectively, which might not suit everyone.