Welcome to the forum. To sort of answer your question, there is a thread about that very issue with the 29RLI located here:
https://www.keystoneforums.com/forum...ad.php?t=57085
You'll see that your trailer is not unique and that there are several other owners with a similar issue.
As for "other manufacturers and other floorplans that share the problem: I'd suspect that it's an issue with a number of floorplans from all manufacturers. For them, the design may boil down to having to choose the "lesser of two evils" that being the choice between omitting some feature or installing it with the knowledge that the addition may affect some other component, or in this situation, the ability to have the island at the expense of access when the slides are in trailer mode.
Some floorplans, not only is the refrigerator not accessible, but the bedroom and bathroom may be totally blocked from use until the slide is opened enough to gain access. With some types of slides, it is MANDATORY that the slide be fully open or fully closed, so there's no ability to "just open enough to get past it"... If you do that, you damage the slide mechanism or alter the alignment and the slide stops working....
Travel trailers are "filled with compromises" Some owners never realize until after they get the trailer home and some issues, none of us ever find a "reasonable reason why" ....