I think the same. FG flow is slowing down. Devs do less mistakes but when they do, we still have good or excellent apologies stuff. You may have noticedit too but event stages gives 1FG less than before but gives one more salticket. Sadly salticket actually worth less than 1FG (even if a roll worth 5FG, tickets don't give Rainbow Shards and don't allow to try priority gacha).
But it seems (at least for me) that FG/rewards/gifts/apologies are better in summer and early fall. Look at last year. We got all the mobile version stuff with FG, rainbow and rainbow ticket. And the year before we got 100 free FG for loging on semptember. And end of winter/spring seems les generous with stuff.
for me there is also some other factors. Some month before we still have Nation missions every week with 5FG for clearing te stages. Now, it's over. And now, we have Petite Centy on the FG shop. That's 6FG not used for Gacha.
But I have the same feelings. My FG are melting too fast and I can't rebuild my stack. I want to try that BB Bunny but it needs so many try and my FG are still low after last event Yarrow.

Just wait and see if it's really slowind down until the end of this year or if it's just a bad season.