Pyracantha and General Pruning and Removing Flowers/Berries For Growing-on

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Location
SE UK
USDA Zone
9a
I recently bought this young nursery pyracantha 'teton' as I thought it had an interesting trunk line, nice tight foliage/nodes and good sacrificial branches.
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I plan to hard prune in spring/summer, to reduce the potential inverse taper points, then allow to grow on for a few years either in a larger container or in the ground (if I can find some space o_O).

I read a general horticulture article for pyracantha, to prune in May (in the UK), as you can tell which branches will host the flowers and berries. I assume they say this, as most people want to keep the shrub aesthetically pleasing all year round. Or is there another reason to keep the berries on shrubs and trees? I kept most berries on the cotoneasters for the birds, but they don't seem to want to eat them anyway.

Does it make much difference to remove all/some flowers or then fruit, for the vigour of the plants one hopes to grow-on? I don't mind removing all flowers and fruit if it means a faster and healthier growing specimen. But I can imagine it depends on overall condition of the tree, species and size of fruit.
Furthermore, I also heard, that plants produce more fruit when stressed, as a sort of last chance to spread mechanism, is this true?

And lastly, does anyone know if the small, tight foliage is just a sign of youth and receiving full sun; or is it generally what this variety of pyracantha produces?
 
Treat it like a weed and it will thrive. Don't bother taking off flower or fruit. It's not going to make any difference on a pyracantha.
I wouldn't put it in the ground but a large pot will work fine. If you put it in the ground it may be tough getting it back up.
Not true of many plants but it is here.
 
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