I think that you are rightly pointing out the biggest problem for the use of bicycles by the Western infantry: the heavy load carried by the soldiers. Bikers of all sorts are well-known to be often fanatical about weight, especially if slopes have to be conquered.
This is one of the reasons why I hardly see even a niche role for most combat operations for Western forces. This leaves for them those roles:
i) Quick and agile short-distance (>15 km) rides for troops at or around military bases. No need for a mother vehicle.
ii) The same for support troops or rotated other forces in theatre if the situation allows. A standard vehicle might work as mother for one or two, a support truck for a couple.
iii) Motorized recce operations might get supported by one or two ebikes strapped to the specific vehicle. Once again it is about relative short distances over terrain which poses difficulties for larger vehicles. Could be forests with narrow trails or urbanized areas.
iv) Infiltrations by various means, for example like those coastline raids by Commandos in WWII in which 'borrowed' bicycles were used. Surprisingly distant targets might be approached that way rather quickly and silently.
v) Patrolling in mostly old urban areas during (very) low-intensity conflicts or stability operations for example by Carabinieri-like troops.
Other armed forces might use them also for:
vi) Portage or 'Pushage' in rather difficult terrain with narrow paths
For most of those niches a powerful engine and batteries are attractive. The ability to fold the bike would also be often highly valuable but has still some considerable downsides. While in some cases like not so deep mud fat tyres might be at a disadvantage overall they should make, at least powered by an electric motor, most tasks quicker, easier and safer. This goes also for full suspension. Overall my personal point of view that in cases like those it is a good maxim to spend more and have a - still cheap - piece of equipment which might be too performant for some activities instead of ending up with stuff not up to some tasks. Obviously there is a good case for two, maybe three types of ebikes.
Your other points are also of interest, I will write about them later.
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