Yes, very true.
I had the f1.8 trinity of: 17mm, 45mm, 75mm and all were good with the 75mm being excellent, but of very limited use.
As a compact pairing, the 17 & 45 could accomplish most of my photo needs especially being like a full-frame equivalent of a 34 and a 90.
I was very attracted to building a system earlier this year off the f1.7 zoom pairing of the 10-25 and 25-50 which would have given me even more (albeit for some extra bulk) or 20-100mm in a pretty compact package compared with a FF system.
I would have done it had my needs been purely video because for my needs, that would tick every box.
It was just the stills side I could not quite commit to, coming from what would be full-frame 47mp S1R!
The 26mp XH2S and 33mp R7 both in APSC were/are 'kind of' just about acceptable to me and having come from XT3 (and many previous Fujis since the X line was introduced), I could have made a case for.
But the 40mp XH2 sealed the deal really.
Arguably, the bodies and lenses are not much different to many full-frame in terms of size & weight (it's 4/3rds for sure where there is a bigger difference) but enough as an overall package/system to work for me.
Could I have made a 4/3rds system work?
Absolutely and no one would have known any different except for one person. Me.
And that is where/why I drew the line I did...
My clients would 100% not notice any difference if I produced a result 4/3rd based, but part of my own 'creative process' would be lost by doing so and this is far more to me than simply running a business for financial gain.
Where do you draw the line? Some might argue that, "well, why don't you stick with full-frame and not 'downgrade' to APSC?" or, "actually, why not go digital medium format and look at the GFX100s?!"
And I have. I've looked at and made business cases for a GFX100s based system and even the new Hassie X2D, but what it came down to in the end was that 'overall system' and cost and what I could justify.
If I had the money, I would 100% build a stills based system off that new Hassie, but arguably would need a pair and 3 lenses (and I don't have close to the 30k it would require) plus invest in the OM-1 + zoom based system I outlined above for another 8k making a total system cost of pushing 40,000!!
Instead, I'm 'settling' for a Fuji based system of around 10k new cost, less the trade in of all my L Mount which will cover at least 50% of that.
Economics has a large part to play!!