>>109669 is correct, and to add more reasons for why they are made:
>many garage kits in the mecha side of things are usually for mechs that get little to no love from their respective IP holder in terms of model kitslooking at you, bamco. solomon's physalis set a benchmark for a 1/100 GP02-A, should bamco ever dare to try engineering a new one
>some groups make garage kit armor replacements that change the aesthetic of an existing off-the-shelf kit
>weapons and accessories in scales not printed by the IP holder (1/100, 1/60, 1/72)
<IP holders and model companies also will steal designs made by independent modelers for garage kits and incorporate it into a future releaseit is a pseudo-symbiotic relationship within the hobby
Garage kits are generally considered to be the highest level of difficulty because of all the tools, time and space required as the previous poster already said. I would steer clear of them until you are comfortable enough with your building, sanding and painting skills to take one on.
If I had to make a heirarchy of model building difficulty, it would probably go like this:
<1(easiest) bamco entry grades and modern high grades
<2(some skill required with cutting parts and sanding): most real grades made after 2018, good smile and master grades from 2010 onwards
<3(attention to detail is needed to achieve best results, and possibly some modifications to joints): Aoshima, Wave, no grade and early high grade gundam kits
<4(painting mandatory, possibly glue as well):Any vehicle kit company like amt, trumpeter, revell, and gw gets tossed in here because they will never prepaint minis
<5(total custom build. you sand, panel line, glue, paint and make all modifications yourself using intuition): garage kit makes