100kHz is not a "high frequency" for an SMPS. Using a MHz or more is not uncommon nowaday's.
Using a full bridge rectifier can only be usefull if the inductor carries current in both directions.
This would also imply using an H-bridge on the primary side to drive the transformer.
With this you can transfer twice as much energy with a transformer core because more of the B-H curve is used.
Alternatively, the same can be done by using (grounded) center taps on the transformer windings. This needs less electronics (only 2 drive transistors and 2 diodes) but the disadvantage is a smaller "copper fill factor", which probably leads to a (slightly) larger transformer core to make room for the extra copper.
Having a full bride rectum fire also leads to 2 diode drops of loss on the secondary side, which reduces efficiency. This can be overcome by synchronous rectification, but you will need 4 synchronous rectifiers, which leads to extra complexity and still need the drive the primary side both ways.