And most of the names now have multiple levels of tools.
homeowner, Professional, Light industrial, Heavy industrial.
All built to different price points, quality, and overall ruggedness.
A 'homeowner' 3/8 hammer-drill is NOT going to perform like the more expensive Pro grade one.
I have seen 1/4 inch homeowner drills without a single bearing in them.
No bushings.
Plastic posts with a round end holding a shaft.
There was a tiny pocket in the end of the post holding a tiny dot of grease.
The chuck wobbled so bad it was darn near useless.
Any bit smaller than ~1/8 inch broke as soon as the hole was more than about 1/4 inch deep.
You could clearly see the circle the tip of the bit traveled in.
I have a Porter-Cable Model 666 "T-handle' 3/8 drill.
It is going on 30 years old now.
The thyristor in the variable speed failed at one point.
I purchased three spare trigger assemblies (probbaly about $8 each) with the thyristor and a few other parts.
Two have been in the 'drill' drawer for at least 10 years now.
The drill and all spare parts are no longer available from P-C.
I still have a 1950 Craftsman 1/2 inch drill.
Aluminum case. Toggle switch trigger.
One slow (~600 RPM) speed.
But it is a real 1/2 horsepower and if the 3/4 inch bit grabs will throw you off the ladder.
It is on its second cord and set of brushes. The odds of parts are about zero.