Absolutely love the new ability to filter storage chests, and the new options on requester chests!
Will come in handy a lot for sure.
As for the fluid wagon, and specifically the barrel changes...
I feel like this was a poor way to go about it. I can understand the fluid wagon changes, they did seem like they carried more than you'd think when they had a capacity of 75k. I feel 25k is a bit low, but can deal with it.
The barrel capacity change though... I think that is just bad. Bilka made a very good point about it from another post:
I understand that the intention was to reduce the cargo wagon capacity for fluids. The drastically reduced capacity of barrels now however means that barrels provide much less usefulness in general. Their throughput using belts and bots was literally devided by 5. One barrel now never holds enough fluid for more than 2 recipes of anything. This means that there are no longer gameplay reasons to use barrels. The only things that speak for using barrels are: The wonky fluid system and its huge performance impact. The latter is basically negated by the need for 5 times as many belts and bots than before. Furthermore, both things should not be reasons to use one mean of transport over another from the players' perspective, because they are not gameplay reasons, they are ways so circumvent technical limitations.
Because of this I propose that instead of lowering general barrel capacity, you should lower barrel stack size. Setting the stack size to 2 will have the desired effect on transport using cargo wagons. It will however keep transport by belts untouched, and only slightly affect transport using bots. This would mean that there would still be an advantage to dealing with barrel logistics.
Essentially, with the way it's been implemented now, barrels are pretty much worthless, especially when transporting by train. Not only do they have less capacity in a cargo wagon compared to a fluid wagon, but they are also more difficult to set up AND now require far more bots or belt usage to get higher throughput.
On top of that, if you had full barrels and now update to 16.8 and unbarrel them you lose 200 liquid per barrel. That adds up quick. Bilka's suggestion would also stop that from happening as well.
Due to this change, a save I have now spent over 400 hours on can not update past this, ever. It will completely break everything. Obviously that is expected in an experiential release, but could have been lessened a lot by doing this in a different way.
As a last point: You guys are always saying how you like to increase and better the performance in Factorio, but now have made a change that does exactly the opposite of that. As Bilka's statement said, it now require far more bots and belts to use barrels, which means more performance heavy. On top of that, you now need longer trains to transport liquids, which also hurts performance due to extra train entities.
There are very few changes and decisions that I've been actually unhappy with in the 3 years I've played Factorio, but I have to say this is definitely one of those by far.