Got the PC1010 in a sys4 with hose. Senco 18g and Makita 23g pinner. Did some flooring yesterday - get in and out was a dream (sys4 + sys2) and job went smooth. Glad I baulked at the new. Tried and true wins again.

You say you were doing flooring, have you tried just using a portanailer and secret nailing through the tongues?
Thats what Ive used on every hardwood floor Ive nailed apart from the two I've glued onto concrete.

What are those dots? Nails into dowels or filler?

if your referring to the floor the nailers are sitting on, they are hand drive cut boat nails countersunk into wide cherry flooring. Customer is super happy, but it drove me nuts. Good thing the checks and splits fit into their rustic aesthetic.....

I'm mainly doing inside finish/trim work, kitchens, flooring, built-in wardrobes.
I had a 18 gauge gas nailer before and it was a total PITA - gas that would off really quickly, not warm enough blah blah. I got rid.
I am now in the market for another.
I have two questions that keep me going round:
-Should I stick to the 18 gauge or is 23 gauge ok for what I do? Will it hold skirting while liquid nail takes hold? Will it hold 18mm painted mdf trim on the side of a wardrobe? I know you can get both but...
-Should I go back to compressor air guns or try the new 18v all electric nailers? I see Makita have a new one Makita DPT353Z. Also Dewalt. Anyone using them?

I can't really afford 2 x electric nailers this month. I could buy the compressor and a couple of nailers though. Still if I could get by with a 23 gauge and it was reliable, that would be the dream.

Am I dreaming?

The hitachi cordless nailers are incredible, I have the 18, 16, and 15. I had the set of m18 Milwaukee nailers, but the brad nailer left gigantic holes in the workpiece which to me defeats the purpose of a brad nailer. And all the Milwaukee nailers have a bit too much recoil imo, especially if you are shooting nails all day.  I was on a search for a long time for a decent cordless nailer, and hitachi is SOLID! I had a ton of m18 tools and zero hitachi- the nailers were impressive enough to me that it was worth having the new battery platform just for the nailers. I still have the m18 15ga (outside the return window was the only reason) and it’s got power, but the recoil gets old. The only downside to the hitachi’s is the brad nailer pretty much can’t drive a 2” brad into solid oak, smaller brads are fine, but the 2” is always at least 1/16th proud, sometimes an inch proud. Oak to pine is fine. I never found pin nailers all that useful for trim, CA glue plus and activator gets it done quickly.