so just to be clear - It is ALL mixing - the question is - where do you mix
your choices are :-
mix prior to the DAW - you put your hardware instruments into a mixer , mix them down and record the output
mix in the DAW - you get an interface with more inputs and record each instrument separately and then mix the output of these in the DAW
so the question then is - where suits you to mix? do you mess about a lot post recording - is it going to frustrate you that you mixed all your instruments and then want to add eq, compression, effects on only one of them ?
or do you basically record live and once it is in the can it is done ? (or is mixing the levels, eq etc part of the performance)
Personally I prefer the option of separating everything out so I went with a multi input interface - I’ve got a PRO 40 with a Behringer ADAT expander for loads of inputs - seemed the most cost effective for me - I suspect you might find a mixer a cheaper option if money is tight.
As ever - there is no single right way to do stuff - it really is what suits your music, your workflow and your bank account that helps make the choice. Also remember that in the 60’s/70s top musicians/producers would have given their right arms for some of the ease of use we currently enjoy in gear 