I can see wanting/using a 10-round mag (assuming one doesnt live in a state already requiring them) if it is a short true 10 rnd as the shorter length is nice when bench shooting. I use some on my Sport 2.
But again unless required I wouldnt see a benefit to the 25 rounders that are pinned to hold just 10.
And i sure wouldnt use the lack of a smaller mag as keeping me from shooting a gun i purchased.
OP, there are many things hard to get right now, and some mags can be truly difficult. Is there a reason you csnt shoot the rifle with the mags it came with?