In general players seek out the most effective strategies. If those strategies aren't fun to play and play against then the game isn't fun and the game dies.
On one hand I can sympathise with those who don't like seeing things made the same unnecesarily: I'm not confident the Soviet sniper needs to be a one woman squad rather than just having its received accuracy change.
On that other hand people are taking this stance to ridiculous levels. I've seen people lamenting the loss of the
Panzerschreck Volks Blob and the suppressing Kubelwagen in the last few days. If you consider the Volksblob unique flavour worth preserving then I don't know what to say to you.
Some things are little asymmetries worth preserving but some things were just bad in practice and needed to go.
2nd part you're talking about is something completely different, its asymmetry and I also do not agree that asymmetry should be sacrificed in favor of balance and mortars generalization is the best example.
I believe factions should have different tools to achieve same goals, meanwhile everyone seems to be getting same toys patch to patch.
I'm not sure there
is a mortar generalization.
The patch notes give the impression of mass standardization because of the strange way they're written. However, the overwhelming majority of changes to the mortars were to traits that were already uniform. The only mortar being 'standardized' is the USF one and that change amounts to a normal setup/teardown speed and slightly more range.