Thanks all for the replies! I have searched the past entries on this camera, and the story seems pretty much the same: great ergonomics, great lenses, but some pesky mechanical issues. Luckily, it seems that electronic issues are very rare.
Hence my asking about repairibility, as the "latest" info on that seems to date from 2015.
(I have always been attracted to the Plaubel Makina 67, but they are expensive to buy and to have repaired. The Bronica, with several lenses, can be had for the price of one Makina 67. That makes the RF645 very attractive. On the other hand, the Makina will function without battery, and is repairable. I don't know if the same can be said of the Bronica)