Welcome to wonderful world of RV'ing!
Just recently, I had a water line leak in the bathroom sink, cabinet made completely around it, no access! I removed panel by cutting it out, having a full door made, increasing storage space, by two fold, also can keep and eye on water lines, etc....Have a friend in cabinet business, minimal cost for door on my end, also would of been not much more for mfg to have full door in that area.
Cabinet maker's thought, it made owners take them back for service, still think it comes down to costs & easiest, quickest way to build & get units out the door.
I have also had to replace, drawer rail supports, around 6 of them from mfg that have broken real early in use. The home depot ones I found, much better design, you would think a plastic piece, costing less than a $1, maybe they would invest, nope, don't count on it!
Other Improvements, which on our end, were minimal costs:
Shelf in cabinets, Switched out bathroom mini spit-toon, with real sink basin, upgraded both faucets (Kitchen & Bathroom), new cabinet door for bathroom vanity, drawer rail supports.
Good thing if you all are little handy, jump in and make improvements, most of it pretty easy to upgrade and improve you rig! Plus the more you know about your unit, the better with maintenance & longevity!!!
Markiemark:C