if you only have one growing space and you use it for veg and flower then vegging is a waste of time. the extra yield that can be achieved by having taller plants and making use of the vertical space you have is lost in terms of overall yield per year, i also think the quality of the finished bud is more consistent on small plants.
that being said i choose to grow large plants and have less harvests per year as a result because that particular way suits my lifestyle and growing isn't my job. if i had more time i would do a lot more plants, utilise every square ft of floor space with growing medium, square pots touching or one big bed.
you can get 5 harvests easily with most 8 week strains, vegging in the flower room means it is a very tough job to get even 4 harvests in a year and if you are only using the same wattage as an sog, the plants will stretch more which leaves the bottom half of the plant with fluffy buds that take longer to ripen.a positive is you can get amazing yields per plant but only doing 3 harvests a year leaves me going a long time without weed