I had 180W for my old HP laptop, and recently ~135W (or 170W) for Thinkpad W541.
<100W adapters were mostly for potato laptops, until USB-C came into picture which supported up to 100W and now manfucaturers adapted (and probably wait for 200W PD).
I must say that I love that I just plug out the laptop power adapter and plug it into my phone (or mouse) and it charges.
Even when it comes with lower performance of the laptop.
<100W adapters were mostly for potato laptops, until USB-C came into picture which supported up to 100W and now manfucaturers adapted (and probably wait for 200W PD).