When using thin clones with Machine Creation Services (MCS), a Citrix Architect should consider that storage and virtual machine migration may be more complex compared to full clones due to the additional steps involved in managing the storage links of thin clones. Storage fragmentation may occur over time because thin clones can create small allocations spread across the storage, leading to fragmentation. Additionally, storage space should be closely monitored because despite thin clones being more efficient in initial storage use, their dynamic nature can lead to variable storage consumption over time as changes are made to the VMs.