Spoke hole plugs instead of rim tape?

I have a set of Campag Neutrons that have these yellow plastic pugs in the spoke holes instead of rim tape. Are there any potential issues with these when riding in the mountains and generating heat on the descents?
Pegoretti
Colnago
Cervelo
Campagnolo
Colnago
Cervelo
Campagnolo
0
Posts
Colnago
Cervelo
Campagnolo
Colnago
Cervelo
Campagnolo
I could recommend them to a colleague having the heaviest wheels in the world built.
Marin Nail Trail
Cotic Solaris
They are lighter but they are probably thicker than rim tape in the middle of rim - which might be why my slightly undersized Vittoria Open Corsas won't fit on my Campag Neutrons.
I understood them to take up less rim well so they make fitting tyres easier.
I used tape and my tyres went on easily, so wasn't worth bothering with.
Boardman FS Pro