You can actually get pretty decent bass if you have a wall/soffit corner to place them in. If you have a corner/soffit to place them, it works even better. Any time you can add surfaces to reflect off of, you will improve the bass response, even outside. It's not like having a subwoofer, but it does improve the sound. I have a pair of 8" 2-ways that we were selling in the late '70s, with Peerless tweeters and maybe a Quam-Gefco woofer with butyl rubber surround. Can't be much bigger than most 8" 2-way outdoor speakers and I drive them with a Sony STR-5800, from about '79. Even 50' down the driveway, it still sounds really good. The sound projects out from the corners and although I might occasionally add some bass, it's not a lot.
It's true, though- it's not necessary to spend a lot on speakers but they'll tend to hold up better over time.