Kinda weird too considering you can run GSM in the HSPA guard bands without a large degradation of HSPA performance.

Typically HSPA is 5mhz+5mhz FDMA, but the carrier is only 3.6mhz+3.6mhz and can be slimmed to 4.2mhzx4.2mhz on Ericsson equipment. NSN equipment can go as low as 3.8x3.8.

In a slim HSPA situation you can run multiple 0.2x0.2 GSM channels.

LTE I've seen all over deployed in 5mhzx5mhz, but I've never seen the 3mhzx3mhz or 1.4mhzx1.4mhz configurations in the wild (they would overload easy).