Did you connect your fender champ to your favorite 4x12? A good part of the amps are combos with specific speaker configurations. Why shouldn’t that model offer up a more appropriate IR? I’d also be happy with an option to user assign an IR to each amp model so that would be offered by default in future instances. Maybe this is something that can also be toggled on and off as an option (assign user favorite IR ON/OFF). I just think starting out with a cab block that is unaware of the amp being used lends to a bit more tedious of a workflow.
I’ve never owned a Champ but I did run my Bassman, Princeton and Deluxe into a GB loaded Marshall 4x12. It was a sweet cab, 1970s large checkerboard grill cloth, speakers were nicely broken in.... kind of miss it but it was so heavy...
I just never really liked the sound of most 1x10 and 1x12 open back combos, at least usually with the stock speakers. Not an uncommon thing as there are hundreds of threads on forums about speaker swaps for Fender combo amps.
Thing is, i didn’t know, or consider for a while that I could even do that. I think I had some impedance mismatch with my Bassman but those old trannies probably didn’t care. Got a cab switch and then found I could have different amps or heads into one cab and it was awesome.
Did they design a Princeton thinking it would drive a 4x12 ? Probably not, but do I care ? Not in the least. I simply am concerned with what sounds good to me. That in my mind is the problem with default pairings, it’s simply what one should do, based on what someone else thinks. If there are no “rules”, a user simply picks a cab they like, that sounds good.
When you get into “you are supposed to’s”, as in, you are supposed to use this cab with this amp because that is how they originally sold it, then your not letting your ears guide you, your letting an old product catalog tell you what to do. Then instead of enjoying your Princeton tone, your using it with a 1x10 and maybe you hate that boxy sound.
Simply saying here are a bunch of amps, here are a bunch of cabs, match up what YOU like is the best possible advice, IMO
If a user then asks “is this right, is this best?” you simply ask, “do you like how it sounds?” and if they say yes, then there is your answer.