I used to have one of their 2.5in hybrid drive in a laptop. Seemed to work well for games. But once SSD's became cheap the tech was not longer worth it. Also, 2.5in drives topped out at 2TB of storage, while NVME and 2.5 Sata SSD's continued to grow in size.
No? Plenty of 2.5" drives in 4TB size and bigger, for example the ST5000LM000 or a WD50NPZZ are 5TB ones. Unless you mean strictly newer laptops, that take 9.5mm or 7mm drives. Which are slim ones.