Brushless itself is not new but recently more popular in power tool. Normal motor has carbon brush which will wear out someday. However, it can be easily replace. Brushless motor has no carbon brush thus no need to change anything. However it is more expensive, just like anything newly introduced into market 

For occasional DIY like you and me, no big deal. I have not wear out any carbon brush yet for many year. Maybe you will use more than me. Even every weekend use also will last more than 5 years perhaps. By that time there are new model wihich is probably better than current brushless one 

You can google youtube and seach for brushless power tool whatever.

Yes, not a brushless, but perhaps you end having 2 drivers when hate to change from 1 bit to another bit.

Example: You want to drill many holes in in brick wall and then put wall plug and then screw. You will find that you want to have one with screw driver bit and one with drilling bit.

Me first buy normal hammer drill. Then get more powerful hammer drill (gave old one to dad in home town). Then later much faster to use rotary hammer drill and end up buying one. Yes the hammer drill has speed control but still too fast  and cannot control torque. So end up buying drill driver yes.... my first cordless one.

You started late and get to find more option and versatile tool 

Yes BL traditionally was more expensive but BL ones nowadays due to economy of scale have made their way as kinda standard feature.. like ABS for cars when first started is not common.. now almost all new cars have it
If landed one technically no restrictions (unless got area rules) so as long as you dont do it too early should be ok la..personally for me afternoon time should be ok... just not 7am on weekend.. just heads up next doors that on sat afternoon or so i wanna do some wood work so they can plan to go out for lunch etc..
Under normal consumer use BL or brushed also won't wear out that fast. Carbon brushes are common spare parts, for bosch, makita easily ordered online or major dealers.