It’s not about making it more or less convenient. It’s simply about different styles and wanting to preserve the “original” style of climbing (trad in its current form isn’t really much like what the first ascensionists of the Victorian era did, but it’s the closest we’ll get).
Whilst it may be appropriate to bolt a route where there’s very little possibility of protecting it otherwise, once a route is bolted, there’s no going back and you immediately take some of the jeopardy out of it. Possibly you even take a bold and interesting route and make it mundane and pedestrian.
I love both sport and trad climbing, but they are different beasts. Sport climbing is about pushing grades, climbing hard and risking (and taking) falls. Trad climbing - whilst it can get hard - is for me more about the technical aspects; well placed protection, good rope work, problem solving, building belays and nice long multi-pitch days climbing mountains. And the leader must never fall!
There is, and always will be probably, conflict between the two schools. Sport climbers think trad climbers are mad to rely on flimsy wires and want to bolt everything. Trad climbers want to stop what they see as their routes getting ruined. As with all things, there is a compromise to be had.