What I mostly dislike about toasts is how they can obscure other elements (actions or information).
On Android, toasts often obscure the keyboard making it hard to type while the toast is being displayed (and still no way of swipe dismissing it after all these years).
On Gnome, various notifications get displayed as central top toasts which obscures the window directly underneath. No swipe to dismiss either, and only by putting the whole system in 'Do-not-disturb' mode do they go away.
On Android, toasts often obscure the keyboard making it hard to type while the toast is being displayed (and still no way of swipe dismissing it after all these years).
On Gnome, various notifications get displayed as central top toasts which obscures the window directly underneath. No swipe to dismiss either, and only by putting the whole system in 'Do-not-disturb' mode do they go away.