Living in the USA, I’ve not been able to try the Libre yet. But I’ve been watching other forums and have noted the adhesive/sensitivity issues you noted. It’s hard to know how frequent these issues are because only those with problems talk about it.
Anyway, a number of solutions have been suggested and it seems different ones work for different folks. Some take additional steps when first applying the sensor. Others do nothing special the first week and only apply special tapes in the second week. Here are a few of the products that have been suggested:
Skin-Tac, OpSite Flexifix, Tegaderm, GrifGrips, Unisolve and Durapore.
Some of these responses go into some detail about how users apply these solutions. But most seem to find a solution and stick with it (pun intended!) I note that many of these products are also used for hospital or surgical procedures, so you may be able to get help from your medical providers.
I very much doubt that Abbott would cut off replacements for the issues you noted. It is in their best interests to keep as many customers happy as possible.