I started using MacBooks in 2007. The generations from around that time until 2012 or so we're marvelous.
- With some models you could open the battery with a simple handle.
- Some models had a small LED bar that you could check the battery status with, without opening the lid.
- Replaceable RAM and disk. In one Pro I replaced the hard drive with an SSD (almost nobody had an SSD yet) and it would fly. I could open all Creative Suite apps (which were still optimized for spinning rust) in three seconds.
After that started the dark ages. Soldered RAM, soldered SSD, no more MagSafe, only USB-C ports, keyboards that could be destroyed with specs of dust. And the overheating Intel CPUs.
In 2019-2021 there was a rebound. First the scissor keyboard returned, then Apple Silicon, and good amounts of ports again.
It was really hard to be a Mac user ~2016-2020.
Some models had a small LED bar that you could check the battery status with, without opening the lid.
On older Mac’s (2009-10?), the LEDs were built into the battery. Very handy to quickly check if your spare has more charge than the one you’re using.