Your goal should not be to buy a hybrid or to “upgrade” to a hybrid. At this point, anyone buying a new vehicle should either be sticking to ICE or going full BEV. Anything else is. generally, a waste of money and tradeoffs.
But the point of this is more to extend the life of existing vehicles. That beater Camry that you have been driving for ten years? For a couple grand you can help the environment and probably make that back in gas over a few years if you mostly drive city.
You definitely lose out. Your trunk space is likely to shrink considerably (since even a 100 km battery is going to have some heft) and your overall gas mileage likely will go down when in ICE mode because of the weight of everything. But, again, if you are mostly commuting to work with a lot of stop and go traffic, it is a good upgrade to consider.