Few disadvantages of market segmentation are:
- Market segmentation increases time and budget pressure by requiring frequent testing of multiple campaign versions.
- It shrinks long-term demand when new customer types never discover the brand.
- Even routine use of personal metrics risks violations when rules change without warning.
- Complex data reviews complicate simple choices that should be made in minutes.
- Brands trying to speak to every audience risk losing the unified story that builds loyalty.
https://whatismarketing.org/advantages-and-disadvantages-of-market-segmentation/Complete list of advantages and disadvantages of market segmentation so check it out.