I wasn't suggesting the service covers need not be removed, I have serviced my ST1100 many times, however it looks to me that one can possibly undo the fasteners for the service cover and slide it around/along/rotate the cover around/along the crash bar to give access to the plugs, oil and water fillers . . .
With iridium plugs fitted, most servicing would only entail the removal of the right hand cover to replace the oil.
I rarely need to top up radiator fluid and only change at required intervals . . On my Police version Topping up only requires the removal of the R/H pannier, seat and R/H side cover, I believe with the ABS version, topping up the coolant is done through the maintenance opening.
Certainly having to remove any crash bars would add a couple of minutes to the minute required to remove the service cover . .