I’m not sure about all the time. The liturgy calls for a graduation of solemnity from ordinary days to solemnities of our Lord, to mark the special character of each occasion. Having incense at all occasions would, IMHO, blur the borders between each level of solemnity. The same with other means of marking the occasion, be it the organ, vestments or chant.
That said I am in favour if it being used at all times at appropriate occasions (Sundays, feasts, solemnities), of course taking into consideration allergies and such. At the abbey, they do not do this because the conventual Mass is for the monastic community and not the faithful. The faithful may attend if they wish but the liturgy is geared towards the sacramental needs of the monks, not those from outside the monastery. A parish Mass is different, it is oriented towards fulfilling the sacramental needs of the parishioners and thus needs to take into consideration things like allergies, etc.